Chapter 1

Rounding

100

Round to the nearest tens place.

11

10

200

Round to the nearest tens place.

38

40

300

Round to the nearest tens place.

374

370

400

Round to the nearest hundreds place.

491

500

500

Round to the nearest hundreds place.

4,260

4,300

Adding

100

Add.

9+6

15

200

Add.

14+8

22

300

Add.
78+92

170

400

Add.
140+98

238

500

Add.
639+125

764

Subtracting

100

Subtract.

19-4

15

200

Subtract.

33-10

23

300

Subtract

47-18

29

400

Subtract.

900-9

891

500

Subtract.

683-394

289

Estimation

100

Estimate the sum.

12+7

20

200

Estimate the sum.

432+489

920 OR 900

300

Estimate the sum.

327+581

910 OR 900

400

Estimate the difference.

73-22

50

500

Estimate the difference.

761-528

230 OR 300

Story Problems

100

Sami scored 84 points in the first round of a new computer game. He scored 21 more points in the second round than in the first round. What was Sami’s total score?

Sami's total score was 189 points.

200

Anna scored 265 points in a computer game. Greg scored 142 points. How many more points did Anna score than Greg?

Anna scored 123 more points than Greg.

300

There are 500 sheets of paper in the pack Hannah bought. She has used 137 sheets already. How many sheets of paper does Hannah have left?

Hannah has 363 sheets of paper left.

400

There were 378 visitors to the science museum on Friday. There were 409 visitors on Saturday. How many more people visited the museum on Saturday?

There were 31 more people at the museum on Saturday.

500

Ravi scores 247 points in a video game. How many more points does he need to score a total of 650?

Ravi needs 403 more points.