Show:
Addition w/ re-grouping
Addition w/o re-grouping
Subtraction w/ re-grouping
Subtraction w/o re-grouping
Bonus!
5

38+72

110

5

30+36

66

5

71-49

22

5

56-24

32

5

378+110

488

10

34+77

111

10

63+23

86
10

75-27

48

10

78-13

65

10

756+122

878

15

24+97

121

15

51+34

85

15

91-47

44

15

98-43

55

15

692+102

794

20

92+79

171

20

84+15

99

20

65-57

8

20

87-24

63

20

722-521

201

25

86+44

130

25

21+77

98

25

96-59

37

25

54-12

42

25

694-331

363