Unit 5-9 Broken Keys

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You found a calculator but some of the keys are broken. For each problem, write how you could use the keys that do work to show the given number. You may ...
5–9

Name

Date

Broken Keys You found a calculator but some of the keys are broken. For each problem, write how you could use the keys that do work to show the given number. You may use the keys for ⴛ, ⴜ, and ⴝ. 1.

Show 12 if the keys for 1 and 2 are broken.

2.

Show 54 if the keys for 5 and 4 are broken.

3.

Show 48 if the keys for 4 and 8 are broken.

4.

Show 42 if the keys for 4, 2, and 6 are broken.

5.

Show 56 if the keys for 5, 6, and 8 are broken.

6.

Show 54 if the keys for 4, 5, and 6 are broken.

7.

Show 40 if the keys for 4 and 0 are broken.

8.

More Than One Answer Write all the different ways you could show 36 on a calculator using only 2 numbers and the keys for ⫻ and ⫽.

5–9

Name

Date

Broken Keys You found a calculator but some of the keys are broken. For each problem, write how you could use the keys that do work to show the given number. You may use the keys for ⴛ, ⴜ, and ⴝ. 1.

Show 12 if the keys for 1 and 2 are broken.

Answers may vary. Sample answer: 3 ⴛ 4 = 2.

Show 54 if the keys for 5 and 4 are broken.

Answers may vary. Sample answer: 9 ⴛ 6 = 3.

Show 48 if the keys for 4 and 8 are broken.

Answers may vary. Sample answer: 6 ⴛ 2 ⴛ 2 ⴛ 2 = 4.

Show 42 if the keys for 4, 2, and 6 are broken.

Answers may vary. Sample answer: (18 ⴜ 3) ⴛ 7 = 5.

Show 56 if the keys for 5, 6, and 8 are broken.

Answers may vary. Sample answer: 2 ⴛ 4 ⴛ 7 = 6.

Show 54 if the keys for 4, 5, and 6 are broken.

Answers may vary. Sample answer: 2 ⴛ 3 ⴛ 9 = 7.

Show 40 if the keys for 4 and 0 are broken.

Answers may vary. Sample answer: 2 ⴛ 2 ⴛ 2 ⴛ 5 = 8.

More Than One Answer Write all the different ways you could show 36 on a calculator using only 2 numbers and the keys for ⫻ and ⫽.

1 ⴛ 36; 2 ⴛ 18; 3 ⴛ 12; 4 ⴛ 9; 6 ⴛ 6 =