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Estimation
Addition with Regrouping
Subtraction without Regrouping
Subtraction with Regrouping
Key Words in Word Problems
100

Round this number to the nearest thousand.

3, 562

4,000

100

356 + 183

539

100

74 - 23

51

100

835-173

662

100

Last week, Peter found 241 sand dollars, 106 sea snail shells, and 82 mini conch shells. How many shells did he find in all?

429 shells

200

1,483 + 204

Estimate by rounding to the nearest HUNDRED and solve.

About 1,700

200

3,385 + 631

4,016

200

1,835 - 104

1,731

200

2,805 - 432

2,373

200

Joshua had 35 socks and 8 shirts in his drawer. He threw away 15 socks because they had holes. How many socks did he have left?

20 socks

300

2,584 + 3,410

Estimate by rounding to the nearest THOUSAND and solve. 

About 6,000

300

8,284 + 1,934

10,218

300

9,736 - 3,502

6,234

300

4,473 - 3,485

988

300

James started his lawn mowing business with $101. He spent $71 on tools and supplies. In his first month of work, he earned $60. How much money did he have?

$90

400

34,084 + 53,814

Estimate by rounding to the nearest  TEN THOUSAND and solve.

About 80,000

400

39,018 + 66,200

105,218

400

48,304 - 23,203

25,101

400

8,295 - 7,457

838

400
The San Juan del Sur Day School has 188 students. The Carol Morgan School has 1200 students. How many more students does the Carol Morgan School have?

1,012 students

500

988,920 + 211,068

Estimate by rounding to the nearest HUNDRED THOUSAND and solve. 

About 1,200,000

500

456,023 + 934,204

1,390,227

500

989,093 - 674,062

315,031

500

636,249 - 163,358

472,891

500

During the month of March, 68,025 pounds of king crab were caught. If 15,614 pounds were caught in the first week of March, How many pounds were caught in the rest of the month?

52,411 pounds