Show:
rounding
addition
estimate
multiplication 1
multiplication 2
100

427 to the nearest 10

430

100

342 + 57 =

399

100

136 + 357

500

100

4 x 3

12

100

7 x 6

42

200

844 to the nearest 100

800

200

217 + 463 =

680

200

228 + 198

400

430

200

8 x 2

16

200

8 x 3

24

300

175 to the nearest 10

180

300

48 + 89 =

137

300

68 + 371

500

440

300

7 x 5

 35

300

7 x 9

63

400

4119 to the nearest 100

4100

400

430 + 121

551

400

734 + 599

1300

1340

400

3 x 5

15

400

9 x 4

36

500

1367 to the nearest 1000

1000

500

1963 + 290

2253

500

19 + 328

300

350

500

2 x 10

20

500

7 x 7

49