Compatible Numbers Worksheet

Practice identifying and using compatible numbers for estimation in addition and subtraction for Grade 3 math.

Grade 3 Math Number SenseCompatible Numbers

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Includes

Multiple ChoiceFill in the BlanksShort AnswerTrue / False

Standards

CCSS.MATH.CONTENT.3.NBT.A.1

Topics

mathgrade 3compatible numbersestimationrounding

6 sections · Free to use · Printable

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Compatible Numbers Practice

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Compatible numbers are numbers that are easy to add, subtract, multiply, or divide mentally. They are often numbers that end in 0 or 5. Use compatible numbers to estimate the answers to the problems below.

1. Which pair of numbers are compatible for estimating 32 + 48?

30 + 40

30 + 50

35 + 50

32 + 48

2. To estimate 73 - 29, which compatible numbers would you use?

70 - 20

70 - 30

75 - 25

73 - 29

Round each number to the nearest ten to find compatible numbers for estimation.

3. 23 + 67 is about +

4. 81 - 19 is about -

5. 46 + 34 is about +

Estimate the answer to each problem using compatible numbers. Show your compatible numbers.

6. Sarah has 58 stickers and her friend gave her 31 more. About how many stickers does Sarah have now?

7. A baker made 92 cookies. He sold 47 of them. About how many cookies does he have left?

Decide if the statement is True or False.

8. For 18 + 72, compatible numbers could be 20 + 70.

True

False

9. To estimate 64 - 11, 60 - 10 are good compatible numbers.

True

False