Estimation Word Problems
Addition using Regrouping
Rounding to estimate the sum
Write the Expression
Subtraction
100

There are 87 kids in third grade and 82 kids in fourth grade. About how many kids are in both grades?

90+80 = 170

100

What is the sum of 333 +128

461

100

What is the sum using rounding? 611 +323

900

100

Allison has three board games, but gets two new board games for her birthday. How many board games does she have?

3+2=5

100

431 - 201=

230

200

About how many cookies are left if there are 234 cookies in the bakery and 146 cookies are sold?

230 + 150 = 380 cookies 

200

What is the sum of 265 +423

688

200

What is the sum using rounding? 248+174

400

200

Ron has 13 yellow apples and 25 red apples. How many apples does he have altogether?

13+25=38

200

Solve. 


1,900 - 456= 

1,444

300

Mr. Armstrong invited 36 people to his birthday party. 18 said they could not make it. Estimate how many people will be at his party. 

40 - 20 = 20 

300

What is the sum of 192 +439

631

300

What is the sum using rounding? 1,659 +2,205

4,000

300

Marsha bought 24 eggs. She used 8 for breakfast. How many eggs does she have now?

24-8=16

300

Solve. 

780 - 532=

248

400

We have been in school for 65 days. There are 187 days of school. Estimate how many days are left. 

190 - 70 = 120 days 

400

What is the sum of 734 +169

903

400

What is the sum using estimation? 2,798 +4,568

8,000

400

Jill bought 2 oranges, 3 apples, and 9 bananas. How many more bananas than oranges did she buy?

9-2=7

400

Solve. 

951 - 367=

584

500

Meliza bought 13 hats. Ms. D bought 5 hats and Brandon bought 7. About how many hats are there in all?

30

500

What is the sum of 612 +308

920

500

What is sum using rounding? 6,647 +5,874

12,000

500

Mr. Lee is 53 years older then his 8 year old grandson. How old is Mr. Lee?

53+8=61

500

Solve. 

1,300 - 962=

338