Casio fx-55 Руководство для преподавателей

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The Smart Calculator

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Exploring Patterns

Thinking Cap

Use the pattern you found in each problem to give the next two products. Use the calculator to check your

answers.

Name:

Ho and Jane were working together on a math assignment. They were using a

calculator to find the products shown below. Jane noticed that the first factor of

each set of products was the same. She wondered if there was a way to use the

calculator to find the products without entering the first factor each time. Ho

said that he knew of a way to use the

to remember the first factor and then use the factor again. Can you help Jane

figure out how Ho used these keys? Explain why your key sequence works.

Then use your key sequence to complete the assignment. Describe the pattern

you see in each problem.

1. 16 x 1 = _________

16 x 10 = _________

16 x 100 = _________

16 x 1,000 = _________

3. 10,989 x 9 = _________

10,989 x 8 = _________

10,989 x 7 = _________

10,989 x 6 = _________

5. 8 x 9 = _________

8 x 99 = _________

8 x 999 = _________

8 x 9,999 = _________

Date:

and the

keys to tell the calculator

2. 1,089 x 1 = _________

1,089 x 2 = _________

1,089 x 3 = _________

1,089 x 4 = _________

4. 9 x 1,089 = _________

9 x 10,989 = _________

9 x 109,989 = _________

9 x 1,099,989 = _________

6. 15,873 x 7 = _________

15,873 x 14 = _________

15,873 x 21 = _________

15,873 x 28 = _________

Casio Fx 55 • 7