Show:
Addition without Regrouping
Subtraction without Regrouping
SURPRISE
Addition WITH Regrouping
Subtraction WITH Regrouping
100

12+12=

24

100

27-14=

13

100

5+5+5=

15

100

18+16=

34

100

30-12=

18

200

23+15=

38

200

38-16=

22

200

12+12=

24

200

26+15=

41

200

42-19=

23

300

32+30=

62

300

74-23=

51

300

29+25=

54

300

38+56=

94

300

51-39=

12

400

101+55=

156

400

88-22=

66

400

77-55=

22

400

118+25=

143

400

90-28=

62

500

235+332=

567

500

487-225=

262

500

555+777=

1,332

500

238+238=

476

500

600-355=

245