Addition (regrouping)
92
+78
_______
170
77
- 28
49
11
+ 27
38
79
-58
21
23
+54
77
+58
95
72
- 34
38
+86
96
85
- 24
61
66
-21
45
38
+13
51
- 11
29
15
+73
88
68
-12
56
81
-15
66
58
+29
87
- 39
13
22
+ 52
74
56
-23
33
80
+65
145
+35
93
96
-77
19
11
+ 82
93
-17
12
63
-34
29