Show:
addition
multipliation
rounding
100

5+5=

10

100

5x5=

25

100

604 to closest 10

610

200

667+25=

692

200

2x7=

14

200

506 to the nearest 10

500

300

7+7=

14

300

9x11=

99

400

7+7+7+7=

28

400

6x7

42

501

50+50+40=

140

501

1x6

6