Casio Fx 55 • 7
Name:
Date:
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The Smart Calculator
Exploring Patterns
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
and the
keys to tell the calculator
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 = _________
2. 1,089
x
1 = _________
16
x
10 = _________
1,089
x
2 = _________
16
x
100 = _________
1,089
x
3 = _________
16
x
1,000 = _________
1,089
x
4 = _________
3. 10,989
x
9 = _________
4. 9
x
1,089 = _________
10,989
x
8 = _________
9
x
10,989 = _________
10,989
x
7 = _________
9
x
109,989 = _________
10,989
x
6 = _________
9
x
1,099,989 = _________
5. 8
x
9 = _________
6. 15,873
x
7 = _________
8
x
99 = _________
15,873
x
14 = _________
8
x
999 = _________
15,873
x
21 = _________
8
x
9,999 = _________
15,873
x
28 = _________
Thinking Cap
Thinking Cap
Use the pattern you found in each problem to give the next two products. Use the calculator to check your
answers.
