addition without regrouping
Solve 10+5
15
Solve 5+6
11
Solve 10-4
6
Solve 6-3
3
Solve 22 +5
27
Solve 5+19
24
Solve 11-6
5
Solve = 15-5
10
Solve 52+33
85
Solve 12+19
31
Solve 66-7
59
Solve 77-10
67
Solve 77+12
89
Solve 36+19
55
Solve 53-15
38
Solve 86-33
53
Solve 124+12
136
Solve 79+43
122
Solve 91-48
43
Solve 267-25
242