Compatible Numbers Worksheet
Practice identifying and using compatible numbers for estimation and mental math in Grade 7.
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Compatible Numbers Practice
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Compatible numbers are numbers that are easy to compute mentally. They are often used for estimation. Read each question carefully and follow the instructions.
Choose the most compatible number for the operation indicated.
1. For 47 + 23, a compatible number for 47 is and for 23 is .
2. For 198 ÷ 5, a compatible number for 198 is .
3. For 31.2 x 9.8, a compatible number for 31.2 is and for 9.8 is .
Estimate the answer using compatible numbers. Choose the best estimate.
4. Estimate: 78 ÷ 4
10
20
30
40
5. Estimate: 512 + 289
700
800
900
1000
6. Explain how you would use compatible numbers to estimate the product of 24 and 16.
Determine if the statement is True or False.
7. When estimating 365 ÷ 6, 360 is a compatible number for 365.
True
False
8. A baker needs to make 108 cupcakes for a party. Each box holds 12 cupcakes. Estimate how many boxes the baker needs using compatible numbers.
9. Use compatible numbers to estimate the sum of 145 and 78. Show your estimation on the number line below.
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