Add/Sub 2-Digits
13 + 17 =
30
2 X 2 =
4
142 + 108 =
250
-3 + 5 =
2
7b - b =
6b
85 - 29 =
56
2 X 5 =
10
293 - 185 =
108
4 - 8 =
-4
3x + 2x =
5x
45 + 71 =
116
2 X 7 =
14
312 + 257 =
569
-5 - 6 =
-11
2(3x) =
6x
61 - 49 =
12
2 X 10 =
20
539 - 472 =
67
-9 + 12 =
3
3(4b) =
12b
86 + 95 =
181
2 X 12 =
24
948 + 136 =
1084
-5 - (-7) =
2
2(4a) + 3a =
11a