Estimating Sums and Differences

​Estimating to find the sum or difference

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​Important Vocabulary Words:

About

Estimate

Sum

Difference ​

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​Vera went on a 3-day trip in which she traveled 336 miles the first day, 423 miles the second day, and 357 miles the third day. About how many miles did she travel on her trip?

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​Step one: Line your numbers up

​336

423

357​

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​

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​Step two: Find the greatest place value all the numbers have in common

​

336

423

357​

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​Step three: round the all the numbers to the greatest place value all these numbers have in common

​

336

423

357​

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​Step four: Now find the sum or difference using the new rounded numbers

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​You just estimated to find a sum

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Multiple Choice

A large bakery baked 832 cupcakes for a party. 308 were vanilla cupcakes and the rest were chocolate. About how many cupcakes were chocolate?

• 500

• 400

• 510

• 450

Multiple Choice

Jill earned $3,589 her first month of work. Her second month, she earned $3,033. About how much money did Jill earn in her two months of work?

• $6,590

• $7,000

• $6,000

• $3,500