Show:
add
subtraction
mutiply
regrouping add
subtract regroup
100

5+6=

11

100

7-5=

2

100

8x2=

16

200

8+9=

17

200

9-3=

6

200

7x9=

63

300

7+8

15

300

4-3=

1

300

8x7=

56

400

2+7=

9

400

10-2=

8

400

2x7

14

500

5+5=

10

500

9-7=

2

500

5x5=

25