900 - Calculator Victor Technology - Free user manual and instructions

Product Type	Desktop Calculator
Brand	Victor Technology
Model	900
Display	12-digit LCD
Power Source	Solar and LR44 battery
Battery Life	Approximately 2 years with normal use
Dimensions (W x D x H)	4.72 x 3.15 x 0.59 inches
Weight	2.47 oz (70 g)
Material	Plastic casing
Color	Black
Basic Functions	Addition, subtraction, multiplication, division, square root, percentage
Memory Functions	M+, M-, MR, MC
Tax Calculation	VAT and tax rate setting
Auto Power Off	Yes, after approximately 7 minutes of inactivity
Key Rollover	Yes, supports rapid entry
Warranty	1 year limited warranty
Cleaning	Wipe with a soft, dry cloth. Do not use liquids or solvents.
Safety Precautions	Keep away from water, heat sources, and direct sunlight.
Spare Parts Availability	Battery (LR44) available at electronics retailers.
Repairability	Battery replacement only; other repairs by authorized service center.

Frequently Asked Questions - 900 Victor Technology

What type of battery does the Victor 900 calculator use?

The Victor 900 uses a single LR44 battery (also known as AG13 or 357). It also has a solar panel for auxiliary power.

How do I replace the battery in the Victor 900?

Slide the battery cover off the back, remove the old battery, insert a new LR44 with the positive (+) side up, and replace the cover.

Why is my calculator display dim?

A dim display usually indicates low battery. Replace the battery and ensure it is inserted correctly. Also, adequate lighting is required for solar operation.

How do I set the tax rate on the Victor 900?

Press and hold the [TAX+] key for 3 seconds, enter the tax rate using numeric keys, then press [TAX+] again to confirm.

Can the Victor 900 calculate percentages?

Yes. To calculate a percentage, use the [%] key. For example, 200 [x] 10 [%] gives 20.

What is the warranty period for the Victor 900?

The Victor 900 comes with a 1-year limited warranty from the date of purchase against defects in materials and workmanship.

How do I clean my Victor 900 calculator?

Use a soft, dry cloth to wipe the exterior. Do not use water, chemical cleaners, or abrasive materials, as they may damage the device.

Does the Victor 900 have memory functions?

Yes, it has memory keys: M+, M-, MR (memory recall), and MC (memory clear). Use them to store and retrieve values.

What should I do if the calculator does not turn on?

First, check the battery: ensure it is installed correctly and has enough charge. If the solar panel is covered, uncover it. If it still doesn't work, try a fresh battery.

Where can I find the user manual for the Victor 900?

The user manual can be downloaded for free from notice-facile.com or the Victor Technology website.
It contains detailed operating instructions and troubleshooting tips.

USER MANUAL 900 Victor Technology

Lesson 1: Learning the Victor 900 Calculator

Overview

Familiarize

students with the calculator.

Teacher Materials “Learning the Victor 900 Calculator” transparency, red transparency markers.

Student Materials Pencil, red crayons, "Victor 900 Calculator" worksheet, calculator

Key Introduced ON/AC

Teaching Notes Distribute the calculators.

Use the transparency to discuss the keys and display

of the Victor 900. Ask students to follow along on their worksheet. The ON/AC key (1) turns the calculator on and clears the display. Write "ON/AC" on the appropriate key and ask the students to do the same. Press the ON/AC key to turn the calculator on.

Show the students the location of the display (2). Ask

what is showing in the display. Write a zero and a decimal point in the display. Ask the students to do the same.

Ask students to write the numbers on the number

keys (3) as you do the same. Press a number key to show how the number shows on the display.

Ask students to write the math operations (÷, X, -, +)

on the math operation keys (4).

TRANSPARENCY

Learning the Victor 900 Calculator

VICTOR 900 AntiMicrobial ① ② ③ ④

Victor 900 Calculator

VICTOR 900 AntiMicrobial CE MRC M- M+ ON/AC -√ % ÷ 7 8 9 X 4 5 6 - 1 2 3 + 0 = +

STUDENT WORKSHEET

Learning the Victor 900 Calculator

VICTOR 900 AntiMicrobial ① ② ③ ④

TEACHER'S GUIDE

Lesson 2: Using the Victor 900 Calculator

Overview Use the calculator to enter and view numbers.

Teacher Materials "Victor 900 Calculator" transparency.

Student Materials Calculator, "Calculator Battle" worksheet, "Calculator Battle Score Sheet", pencil.

Keys Used

1 - 9, ON/AC

Teaching Notes Distribute the calculators.

Ask the students to press the ON/AC key.

Ask the students to press the "1" and "9" keys to enter the number "19". Ask "How do you clear the number 19 from the display"? Answer: press the ON/AC key

To play “Calculator Battle”, pair up the students. Explain the following game rules:

➢ Cut out the Calculator Battle cards (one set for each pair of students).
- Mix the cards and place face down in one pile.
➢ Student A draws a card and enters the number on their calculator.
➢ Student B draws a card and enters the number on their calculator.
The students compare the displays. The student with the largest number scores a hit and enters "1" on the score sheet.
Both students press the ON/AC key.
The game continues until all cards are gone. The player with the most hits wins.

STUDENT WORKSHEET

Calculator Battle

STUDENT WORKSHEET

Calculator Battle Score Sheet

*▼◆**■▼☆☆○※	*▼◆**■▼+☆○※
★※▲	★※▲

TEACHER'S GUIDE

Lesson 3: Addition

Overview Use the calculator to add numbers.

Teacher Materials “Addition” and “Correcting Wrong Entries” transparencies.

Student Materials Pencil, Calculator, and "Calculator Connections" worksheet.

Keys Introduced +, CE

Teaching Notes

Display the “Addition” transparency. Ask the students to press the buttons as illustrated.

Display the "Correcting Wrong Entries" transparency. Ask the students to press the buttons as illustrated.

The “Calculator Connections” worksheet provides additional practice. Ask students to solve each addition problem with the calculator and connect the box with the correct answer by drawing a line.

TRANSPARENCY

Addition

$$ 1 + 2 = ? $$

$$ 1 + 3 + 5 = ? $$

Press these buttons:

ON/AC

1 +

2

=

The calculator shows:

0.

1.

2.

3.

ON/AC

1 +

3

+

5

=

0.

1.

3.

4.

5.

9.

TRANSPARENCY

Correcting Wrong Entries

$$ 6 + 3 = ? $$

Press these buttons:

ON/AC

6 +

2

CE

3

=

The calculator shows:

0.

6.

2.

0.

3.

9.

Calculator Connections

Add the numbers in the boxes on the left side of the page. Draw a line to the box on the right side with the correct answer.

34 + 41 76 13 + 12 93 1 + 19 75 72 + 21 77 67 + 9 33 47 + 33 80 3 + 74 25 11 + 22 20

TEACHER'S GUIDE

Lesson 4: Subtraction

Overview Use the calculator to subtract numbers.

Teacher Materials "Subtraction" transparency.

Student Materials Pencil, Calculator, and "Calculator Connections II", and "Big Number Math" worksheets.

Keys Introduced - (minus key)

Teaching Notes Display the "Subtraction" transparency.

The "Calculator Connections" worksheet provides

additional practice. Ask students to solve each subtraction problem with the calculator and connect the box with the correct answer by drawing a line.

TRANSPARENCY

Subtraction

$$ 9 - 5 = ? $$

$$ 8 - 1 - 2 = ? $$

Press these buttons:

ON/C

9 -

5

=

The calculator shows:

0.

9.

5.

4.

ON/C

8 -

1

-

2

=

0.

8.

1.

7.

2.

5.

Calculator Connections II

Subtract the numbers in the boxes on the left side of the page. Draw a line to the box on the right side with the correct answer.

186 -22	121
54 -51	88
99 -11	164
222 -11	211
677 -556	3
69 -42	27
32 -18	26
55 -29	14

STUDENT WORKSHEET

Big Number Math

Use your calculator to subtract the big numbers in the boxes and write down the answers. Circle the biggest answer.

72,456	98,744
-51,432	-10,221

189,456

-10,432

5,687	984,300
-3,216	-213,498

676,345

-99,999

780,780	54,893
-175,175	-55,221

TEACHER'S GUIDE

Lesson 5: Repetitive Subtraction and Addition

Overview Use the calculator to subtract or add repetitive numbers using the constant function.

Teacher Materials “Repetitive Subtraction and Addition” and “Fastest Fingers” transparencies.

Student Materials Pencil, Calculator, and "Constant Calculations" worksheet.

Keys Introduced Constant function using the = Key. □

Teaching Notes Ask your students to enter 10 on the calculator and add 10 to the total every time you snap your fingers. Snap your fingers 4 times and compare the answers from several students (the answer should be 50).

Tell the students how the calculator stores the last command and number entered. This is called the constant function. The constant function helps reduce mistakes and save time when you must subtract, add, divide, or multiply the same number many times.

Ask your students to again enter 10 on the calculator and add 10 every time you snap your fingers. Snap your fingers 4 times and compare the answers.

Note: The constant is removed from memory when the ON/AC button is pushed.

Use the “Fastest Fingers” transparency to play a fun game that reinforces the constant function.

Use the “Constant Calculations” worksheet for practice.

TRANSPARENCY

Repetitive Subtraction and Addition

$$ 1 5 - 3 - 3 - 3 = ? $$

$$ 6 + 2 + 2 + 2 = ? $$

Press these buttons:

ON/AC

15 -

3 =

=

=

The calculator shows:

0.

15.

12.

9.

6.

ON/AC

6 +

2 =

=

=

0.

6.

8.

10.

12.

TRANSPARENCY

Fast Fingers

Enter 500 + 5 = on your calculator. When the teacher says “Go” add one to your calculator as many times as you can until the teacher says “stop”.

The student with the largest number has the fastest fingers.

Pixelated hand cursor icon pointing upward (no text or symbols)

Winning total: ____

Name of Student with the Fastest Fingers

STUDENT WORKSHEET

Constant Calculations

Use the = key to work these constant calculations.

1. 94 - 6 - 6 - 6 = ____
2. 945 + 12 + 12 + 12 = ____
3. 543 - 10 - 10 - 10 - 10 = ____
4. 345 + 22 + 22 + 22 + 22 = ____
5. 27 - 3 - 3 - 3 - 3 - 3 = ____
6. 45 + 5 + 5 + 5 + 5 + 5 = ____
7. 1000 - 100 - 100 - 100 - 100 = ____
8. 2000 + 50 + 50 + 50 + 50 + 50 = ____
9. 948 - 8 - 8 - 8 - 8 - 8 = ____
10. 604 + 4 + 4 + 4 + 4 + 4 + 4 = ____
11. 9987 - 3 - 3 - 3 - 3 - 3 = ____
12. 100 + 9 + 9 + 9 + 9 + 9 + 9 = ____

TEACHER'S GUIDE

Lesson 6: Multiplication

Overview Use the calculator to multiply numbers.

Teacher Materials “Multiplication” and “Multiplication Mountain Answer Key”, “Multiplying Multiple Numbers”, and “Repetitive Multiplication” transparencies.

Student Materials Pencil, Calculator, and "Multiplication Mountain", "Multiplication Calculator Battle", and "Calculator Connections III" worksheet.

Keys Introduced X

Teaching Notes Display the "Multiplication" transparency. Ask the students to follow along with you as you discuss the exercise.

The “Multiplication Mountain” worksheet provides additional practice. Ask students to solve each multiplication problem with the calculator and fill in the illustration.

To play “Multiplication Calculator Battle”, pair up the students. Explain the following game rules:

➢ Cut out the Multiplication Calculator Battle cards (one set for each pair of students).
- Mix the cards and place face down in one pile.
➢ Student A draws two cards and multiplies the numbers on their calculator.
➢ Student B draws two cards and multiplies the numbers on their calculator.
The students compare the displays. The student with the largest number scores a hit and enters "1" on the score sheet.
Both students press the ON/AC key.
The game continues until all cards are gone. The player with the most hits wins.
To extend the game, mix the cards and start again

The “Calculator Connections III” worksheet provides additional practice. Ask students to solve each multiplication problem with the calculator and connect the box with the correct answer by drawing a line.

Multiplication

$$ 6 \times 8 = ? $$

$$ 4 3 \times 5 = ? $$

Press these buttons:

ON/AC

6

X

8

=

The calculator shows:

0.

6.

8.

48.

ON/AC

43

X

5

=

0.

43.

5.

215.

STUDENT WORKSHEET

Multiplication Mountain

Across Down

1 10 × 10 = ____ 2 5 × 4 = ____

26×4= 347×20=

3 3 X 3,201 = ____ 4 19 X 4 = ____

4 25 X 3,161,825 = ____ 5 16 X 1,193 = ____

5 156 X 921 = ____ 6 27 X 89 = ____

6 48 X 56 = ____ 7 2 X 4,817 = ____

7 11 X 9 = ____ 8 1,973 X 5 = ____

14 19 X 40 = ____ 932 X 274 = ____

10 2,503 X 25 = ____

11 27 X 2 = ____

12 11 1 X 7 = ____

13 13 X 2 = ____

TRANSPARENCY

Multiplication Mountain

Answer Key

Multiplying Multiple Numbers

6×8×2=?

Press these buttons:

ON/AC

6 X

8

X

2

=

The calculator shows:

0.

6.

8.

48.

2.

96.

TRANSPARENCY

Repetitive Multiplication

$$ 4 \times 2 = ? $$

$$ 4 \times 4 = ? $$

$$ 4 \times 6 = ? $$

$$ 4 \times 8 = ? $$

Press these buttons:

ON/AC

4 X

2

=

4

=

6

=

8

=

The calculator shows:

0.

4.

2.

8.

4.

16.

6.

24.

8.

32.

Multiplication Calculator Battle

Multiplication Calculator Battle Score Sheet

*▼◆※※■▼ ☆☆○※↑	*▼◆※※■▼ + ☆○○※↑
★※▼▲	★※▼▲

Calculator Connections III

Multiply the numbers in the boxes on the left side of the page. Draw a line to the box on the right side with the correct answer.

TEACHER'S GUIDE

Lesson 7: Division

Overview Use the calculator to divide numbers.

Teacher Materials “Two Methods for Writing Division Problems”, “Division”, and “Repetitive Division” transparencies.

Student Materials Pencil, Calculator, and "Calculator Connections IV" worksheet.

Keys Introduced ÷

Teaching Notes Display the transparencies. Ask the students to follow along with you as you discuss the exercise.

The “Calculator Connections IV” worksheet provides additional practice. Ask students to solve each division problem with the calculator and connect the box with the correct answer by drawing a line.

TRANSPARENCY

Two Methods for Writing Division Problems

Hand Written Method

Quotient 8 48 6 Divisor Dividend

Calculator Method

Divisor 48 ÷ 6 = 8 Dividend Quotient

TRANSPARENCY

Division

$$ 4 8 \div 6 = ? $$

$$ 8 1 \div 3 = ? $$

Press these buttons:

ON/AC

48 ÷

6

=

The calculator shows:

0.

48.

6.

8.

ON/AC

81 ÷

3

=

0.

81.

3.

27.

TRANSPARENCY

Repetitive Division

$$ 1 0 0 \div 4 = ? $$

$$ 4 0 \div 4 = ? $$

$$ 8 8 \div 4 = ? $$

$$ 5 2 \div 4 = ? $$

Press these buttons:

ON/AC

100 ÷

4

=

40

=

88

=

52

=

The calculator shows:

0.

100.

4.

25.

40.

10.

88.

22.

52.

13.

Calculator Connections IV

Divide the numbers in the boxes on the left side of the page. Draw a line to the box on the right side with the correct answer.

125 ÷ 25	100
49 ÷ 7	6
1000 ÷10	5
66 ÷ 11	7
72 ÷ 2	36
888 ÷ 4	110
550 ÷ 5	222
147 ÷ 21	7

TEACHER'S GUIDE

Lesson 8: Division with Remainders

Overview Use the calculator to divide numbers with remainders.

Teacher Materials “Two Methods for Writing Division with Remainders”, “Division with Remainders”, “Repetitive Division with Remainders”, and “Calculating the Remainder”, transparencies.

Student Materials Pencil, Calculator, and "Calculator Connections V" worksheet.

Keys Introduced ÷

Teaching Notes Display the transparencies. Ask the students to follow along with you as you discuss the exercise.

Inform the students how the calculator displays the

"remainder" as digits to the right of the decimal point. Use the "Calculating the Remainder" transparency to show how to determine the remainder. To find the remainder, multiply the number to the left of the decimal point by the divisor. Then subtract the result from the dividend to get the remainder.

The "Calculator Connections V" worksheet provides

additional practice. Ask students to solve each division problem with the calculator and connect the box with the correct answer by drawing a line.

TRANSPARENCY

Two Methods for Writing Division with Remainder Problems

Hand Written

graph TD
    A["Quotient"] --> B["9.6 / (485)"]
    C["Remainder"] --> B
    D["Divisor"] --> B
    E["Dividend"] --> B

Calculator Method

Divisor Remainder 48 ÷ 5 = 9.6 Dividend Quotient

TRANSPARENCY

Division with Remainders

$$ 4 8 \div 5 = ? $$

$$ 7 4 \div 6 = ? $$

Press these buttons:

ON/AC

48

÷

5

=

The calculator shows:

0.

48.

5.

9.6

ON/AC

74

÷

6

=

0.

74.

6.

12.3333333

TRANSPARENCY

Repetitive Division with Remainders

$$ 1 0 0 \div 6 = ? $$

$$ 4 0 \div 6 = ? $$

$$ 8 8 \div 6 = ? $$

$$ 5 2 \div 6 = ? $$

Press these buttons:

Calculating the Remainder

$$ 7 6 \div 8 = ? $$

Press these buttons:

ON/AC

76 ÷

8

=

The calculator shows:

0.

76.

8.

9.5

9 X

8

=

9

8.

72

76 -

72

=

76.

55.

4.

The remainder is 4.

STUDENT WORKSHEET

Calculator Connections V

Divide the numbers in the boxes on the left side of the page. Draw a line to the box on the right side with the correct answer.

TEACHER'S GUIDE

Lesson 9: Decimals

Overview Use the calculator to add and subtract numbers with decimals.

Teacher Materials "Decimals" transparency

Student Materials Pencil, Calculator, "Calculator Connections VI" worksheet, "Estimation Exploration" worksheet, and "I Love Decimals" worksheet.

Keys Introduced

Teaching Notes The “Calculator Connections VI” worksheet provides additional practice. Ask students to solve each math problem with the calculator and connect the box with the correct answer by drawing a line.

The “Estimation Exploration” worksheet, is an additional way to have a fun time with decimals. It shows the difference between estimated and exact answers. It is another way to improve skills and learn more about decimals and using the calculator.

Decimals

$$ 2. 5 + 5. 3 = ? $$

$$ 7. 4 - 6. 1 = ? $$

Press these buttons:

ON/AC

2.5

+

5.3

=

The calculator shows:

0.

2.5

5.3

7.8

ON/AC

7.4

-

6.1

=

0.

7.4.

6.1

1.3

Calculator Connections VI

Add the Decimals in the boxes on the left side of the page. Draw a line to the box on the right side with the correct answer.

$$ \boxed { \begin{array}{c} 1 6. 4 \ + 5. 3 \end{array} } $$

$$ 1. 5 $$

$$ \begin{array}{c} 3. 2 \ - 1. 7 \end{array} $$

$$ 3. 5 $$

$$ \boxed { \begin{array}{c} 2. 5 \ + 7. 1 \end{array} } $$

$$ \boxed {2 1. 7} $$

$$ \begin{array}{r} 2. 3 \ + \quad 1. 2 \ \hline \end{array} $$

$$ 2 0. 5 $$

$$ \begin{array}{c} \framebox {2 3. 1} \ - 2. 6 \end{array} $$

$$ 1 3. 8 $$

$$ \boxed { \begin{array}{c} 9. 7 \ + 4. 1 \end{array} } $$

$$ 1 2. 5 $$

$$ \begin{array}{c} \framebox {5. 1} \ - 1. 4 \end{array} $$

$$ \boxed {9. 6} $$

$$ \boxed { \begin{array}{c} 1 4. 7 \ - 2. 2 \end{array} } $$

$$ \boxed {3. 7} $$

STUDENT WORKSHEET

I Love Decimals

Estimate the answer for the math problems then use your calculator to check the answers. Write your estimates in the left arc of the hearts and the calculator answers in the right arcs.

Example:

TEACHER'S GUIDE

Lesson 10: Memory

Overview Use the calculator to add and subtract numbers and store the numbers in the calculator's memory

Teacher Materials “Calculator Memory”, “Adding Products with Memory”, and “Find the Total Cost Using Memory”, transparencies.

Student Materials Pencil, Calculator, and "Million Memory Magic" worksheet.

Keys Introduced

MRC M+ M-

Teaching Notes Talk to the students about memory, and how it works on a calculator. The memory icon will appear on the calculator screen when a number has been stored. To view the stored number, press the MRC button once. MRC stands for “Memory Recall & Clear”. If the MRC key is pressed twice, the memory is cleared.

M+ Adds the displayed number to the memory of the calculator

M- Subtracts the displayed number from the memory of the calculator

MRC Displays the number from the memory onto the screen of the calculator

MRC MRC Clears the memory

The Million Memory Magic worksheet is for students to practice using the memory function of the calculator. It is to be done individually to test the skills learned in the lesson. Understanding this worksheet will show fulfillment and accomplishment with this lesson.

You should ask students to press the MRC key twice before the exercise ... to make sure everyone starts with a clear memory.

TRANSPARENCY

Calculator Memory

M+

Adds the displayed number to the memory of the calculator

M-

Subtracts the displayed number from the memory of the calculator

MRC

Recalls and displays the number in memory

MRC

MRC

Clears the memory

TRANSPARENCY

Adding Products with Memory

What is the total of the three equations below?

$$ 2 \times . 8 6 = ? $$

$$ 3 \times 1. 4 9 = ? $$

$$ 4 \times . 5 2 = ? $$

Press these buttons:

ON/AC MRC MRC

ON/AC

The calculator shows:

0.

2 x . 99 =

1.98

M+

MEMORY 1.98

3 x 1 . 49 =

MEMORY 4.47

M+

MEMORY 4.47.

4 x . 52 =

MEMORY 2.08

M+

MEMORY 2.08

MRC

MEMORY 8.53

TRANSPARENCY

Find the Total Cost Using Memory

3 \$5 Items

6 \$2

\$13 Discount = ?

Press these buttons:

ON/AC MRC MRC

ON/AC

The calculator shows:

0.

3 x 5 =

15.

M+

MEMORY 15

6 x 2 =

MEMORY 12

M+

MEMORY 12

MRC

MEMORY 27

- 13 =

MEMORY 14

Million Memory Magic

Use the Memory function to quickly divide 1,000,000 by 1 through 10. Enter 1,000,000 into memory. Use the MRC key to recall the 1,000,000 value instead of re-entering 1,000,000 for each equation.

$$ \boxed {1, 0 0 0, 0 0 0 \div 1 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 2 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 3 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 4 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 5 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 6 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 7 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 8 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 9 =} $$

$$ \boxed {1, 0 0 0, 0 0 0 \div 1 0 =} $$

TEACHER'S

Lesson 11: Percents

Overview Use the calculator for situations involving sales taxes, discounts, or other percent problems.

Teacher Materials “Percents” and “More Percents” transparencies.

Student Materials Pencil, Calculator, and "Would You Like To Own an Amusement Park?" worksheet.

Keys Introduced %

Teaching Notes Remember the % key acts like the = key so = does not need to be pressed at any point when doing percents

For the game where the students have to make up an

Amusement Park and have to figure out what the discounted price with tax will be, is a way for the students to look at a real life situation. They use their new knowledge of percents to figure out the discounts that they one day might be using and then they will know how much money they are saving.

Percents

3.70 - 12% discount = ? \7.50 + 6% sales tax = ?

Press these buttons:

ON/AC

ON/AC

3.70

-

12

%

The calculator shows:

0.

3.70

3.256

7.50

+

6

%

7.50

7.95

TRANSPARENCY

More Percents

4.90 - 15% discount = ? \\8.20 + 7% sales tax

Press these buttons:

ON/AC

ON/AC

4.90

-

15

%

The calculator shows:

0.

4.90

4.165

8.20

+

7

%

8.20

8.774

STUDENT WORKSHEET

Would you like to own an Amusement Park? Decide what rides to offer and set the ticket price for each ride. Offer a 10% discount. Use 5% for the Tax rate and calculate the final price.

's Park

Name of Ride	Twister
Original Cost of Ride	10.00
% discount	10%
Sale Price	9.00
Sales Tax %	5%
Final Cost	$9.45

TEACHER'S

Lesson 12: Interest

Overview Use the \% key to determine interest amounts for a loan.

Teacher Materials “Simple Interest” and “Total with Interest” transparencies.

Student Materials Pencil, Calculator, and "Interesting Ride" worksheet.

Keys Introduced %

Teaching Notes Remember the % key acts like the = key so = does not need to be pressed at any point when doing percents

The worksheet “Interesting Ride” is fun and interesting to students. Word problems that portray real life situations can better focus the mind and show how interest will one day affect the student.

TRANSF

Simple Interest

\$750.00 at 13% =? \$299.00 at 3% =?

Press these buttons:

ON/AC

ON/AC

750

x

13

%

The calculator shows:

0.

750.

97.5

299

x

3

%

299.

8.97

TRANSPARENCY

Total with Interest

$$ \$ 490 + 15\% = ? $$

Press these buttons:

ON/AC

ON/AC

490

+

15

%

The calculator shows:

0.

490.

563.5

820

+

7

%

820.

877.4

INTERESTing Ride

Hop aboard and get ready for the INTERESTing ride!!

Below are a few problems that are fun. Come along and enjoy the ride.

😊 Mr. Bob has a piggy bank that has \$300.00 in it. The piggy pays Mr. Bob 3% per year. How much interest will piggy pay Mr. Bob in the first year?
Mrs. Bob has a jar full of \$3,500.00 all in pennies that is 350,000 pennies. Every year the jar pays Mrs. Bob 9% interest. How much money will the jar pay Mrs. Bob at the end of the year?
😊 Mr. and Mrs. Bob have a bank account for Little Bob their son. At the start of the year, they put a deposit of \$2,500.00. The bank pays a yearly interest of 6%. How much will Mr. and Mrs. Bob have at the end of the year?
😊 Sam, Little Bob’s friend asks Little Bob for \$50 to buy ice cream for a month. Little Bob is smart and gives Sam the money with a fee of 2% interest. How much money total will Sam have to pay Little Bob at the end of the month?
😊 Mr. Smith works with Mr. Bob, and they both need lunch, but Mr. Bob does not have money with him. Mr. Smith pays \$15 for Mr. Bob’s lunch and says to pay him back in 4 days with 2% interest for everyday until he pays. How much money will Mr. Bob have to pay Mr. Smith total in 4 days?

TEACHER'S GUIDE

Lesson 13: Square Roots and Squares

Overview Use the calculator to determine the square and square root of numbers.

Teacher Materials “Why Call it the “Square”, “Square Roots”, and “Squares” transparencies.

Student Materials Crayons, Calculator, and "Square Grid" worksheet.

Keys Introduced √

Teaching Notes Remember to explain that Square roots and Squares are inverses of each other.

Write

the

following

$$ 1 0 \times 1 0 = 1 0 0 $$

Show how 100 is the square of 10. Explain that 10 is the square root of 100.

Provide copies of the "Square Grid" worksheet to students. Ask the students to draw colored boxes representing the Square of 1, 2, and 4.

STUDENT WORKSHEET

Why Call it the “Square”?

When small squares are used to make a larger square you can see why we use the term “Square”.

3 high 3 wide = 9 9 is the "Square" of 3.

3 is the “Square Root” of 9.

TRANSF

Square Roots

$$ \surd 1 2 1 = ? $$

$$ \surd 2 2 5 = ? $$

$$ \surd 3 6 = ? $$

Press these buttons:

ON/AC ON/AC

121 √

225 √

36 √

The calculator shows:

0.

11.

15.

6.

TRANSPARENCY

Squares

$$ 1 2 ^ {2} = ? $$

$$ 4 ^ {2} = ? $$

Press these buttons:

12 x 12

The calculator shows:

0.

144.

4 x 4

16.

STUDENT WORKSHEET

Square Grid