Show:
one digit by one digit subtraction
two digit by one digit addtion
two digit by two digit
two digit by two digit with regrouping
two digit by two digit subtraction
100

8-2=

6

100

16+2=

18

100

12+10=

22

100

15+15=

30

100

20-10=

10

200

9-4=

5

200

23+4=

27

200

15+12=

27

200

17+14=

31

200

30-20=

10

300

8-5=

3

300

19+6=

25

300

18+11=

29

300

18+14=

32

300

50-20=

30

400

6-5=

1

400

25+4=

29

400

23+13=

36

400

24+18=

42

400

80-40=

40
500

9-9=

0

500

27+8=

35

500

31+14=

45

500

26+19=

45

500

90-50=

40