add within 100
rows and coulums
regrouping
100

10+30=?

40

100

3+3+3+3

12

100

88+13

101

200

43+32=?

75

200

5+5+5+5=

20

200

98+13

111

300

75+15=?

90

300

7+7+7+7

28

300

36+13

49

400

85+15=?

100

400

9+9+9+9

36

400

26+13

39

500

35+23=?

58

500

11+11+11+11

44

500

16+13

29

M
e
n
u