Show:
ADDITION
SUBTRACTION
ROUNDING
MULTIPLICATION
RANDOM
100

5+5

10

100

9-5

4

100

13 + 13 - estimate by rounding nearest 10th 

10 + 10 = 20 

100

5 x 2 

10

100

12 + 12

24

200
10+20

30

200

20-15

5

200

25 + 25 - nearest 10th place

30 + 30 = 60 

200

12 x 12

144

200

24 - 17

7

300

40+65

105

300

45-26

19

300

325 + 260 - nearest 100 place

300 + 300 = 600

300

25 x 6

150

300

14 x 3

42

400

400+400

800

400

436-327

109

400

359 + 585 - nearest 100 place

400 + 600 = 1000

400

36 x 8

288

400
Round 342 to nearest 100th place

300

500

570+610

1180

500

680-545

135

500

648 - 687 - nearest 10th place

650 - 690 = 40

500

30 x 4

120

500

292 + 328 - round sum to nearest 100th place

600