Rounding 10s
Rounding 100s
Estimate
3 Digit Addition Problems
3 Digit Subtraction Problems
100

42

40

100

242

200

100

True or false. 350+450 is LESS than 1,000.

True.

100

Ashley and Alex collected soda cans to recycle. Ashley had 275 cans and Alex had 168 cans. How many cans did they have in all?

443 cans

100

This month Rachel and Hannah had a contest to see who could read the most pages in class. By the end of the month, Rachel read 194 pages in class and Hannah read 158 pages. How many more pages did Rachel read?

36 pages

200

85

90
200

485

500

200

True or false. 750+300 is LESS than 1,000.

False.

200

405 + 112

517

200

624-616

8

300

629

630

300

629

600

300
About how much is 690 + 190? (Think rounding!)

900

300

543 + 529

1,072

300

182 – 117

65

400

812

810

400

812

800

400
About how much is 720 + 110? (Think rounding!)

800

400

Dakota and Marcus are raising money to donate to their local animal shelter. Dakota raised $297 and Marcus raised $325. How much money did they raise in all?

622

400

224 – 115

109

500

1,325

1,330

500

1,325

1,300

500

About how much is 922 + 333? (Think rounding!)

1200

500

263 + 498

761

500

The school had 253 students. Over winter break, 64 students moved away, but 16 new students moved in. How many students are now in the school?

205 students

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