Compatible Numbers Worksheet
Grade 4 math worksheet focusing on understanding and using compatible numbers for estimation and mental math.
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Compatible Numbers
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Read each question carefully and follow the instructions. Compatible numbers are numbers that are easy to compute mentally. They are often used to estimate answers.
1. Compatible numbers are numbers that are easy to mentally.
2. We often use compatible numbers to answers.
3. When adding 48 + 53, a good pair of compatible numbers would be + .
4. Which pair of compatible numbers would you use to estimate 72 + 29?
70 + 20
70 + 30
80 + 30
75 + 25
5. Use compatible numbers to estimate the sum of 196 + 304. Explain your reasoning.
6. 25 and 75 are compatible numbers for addition because they add up to 100 easily.
True
False
Match each number with a compatible number for addition.
7. 47
a. 80
8. 21
b. 50
9. 78
c. 20
10. Plot the numbers 12 and 38 on the number line. Then, use compatible numbers to estimate their sum and show where the estimated sum would be on the number line.