Estimating Sums and Differences by Rounding

Round to the nearest hundred to estimate the sum.
479 + 432 = 

• 800

• 1,000

• 900

• 100

Estimate the sum: 1,432+1,564

• 2,000

• 2,100

• 2,996

• 3,000

If you have 382, you might say you have ABOUT...

• 400

• 300

• 450

• 350

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

• 400 + 100 = 500
• 400 + 200 = 600
• 400 + 200 = 500
• 300 + 100 = 400

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CCSS.2.NBT.B.5

There are 324 kids at The Green School and 399 kids at The Blue School. Estimate how many kids there are in total to the nearest hundred.

• 640

• 700

• 345

• 900

To celebrate Halloween a family is counting pumpkin seeds. Max and his dad counted 243; Brita and her mom counted 333. To the nearest ten, about how many more seeds did Brita and her mom count?

• 85

• 90

• 100

• 500

Estimate the sum of 42+59 by rounding to the nearest tens

• 110

• 100

• 111

• 90

To the nearest ten, what is the estimated difference of

426 - 210?

(a)  

Mrs. Kelly ordered 325 pet toys and 165 bags of dog food for her new pet store. Which is the best estimate of the total number of items Mrs. Kelly ordered?

• 400

• 500

• 600

• 700

Mrs. Haskins has $459 in her savings and $101 in a piggy bank in her closet. To the nearest hundred dollars, approximately how much money does she have altogether?

• 600

• 605

• 500

• 560