Friendly number strategy
34 + 28 =
34 + 30 = 64
64 - 2 = 62
25 + 32 =
20 + 30 = 50
5 + 2 = 7
50 + 7 = 57
6 + 8 =
14
+ 18
85
55 + 32 =
55 + 30 = 85
85 + 2 = 87
64 + 33 =
60 + 30 = 90
4 + 3 = 7
90 + 7 = 97
12 + 5 =
17
77
+ 52
129
88 + 23 =
90 + 23 = 113
113 -2 = 111
71 + 42 =
70 + 40 = 110
2 + 1 = 3
110 + 3 = 113
15 + 20 =
35
429
+ 367
796
59 + 34 =
60 + 34 = 94
94 - 1= 93
56 + 29 =
50 + 20 = 70
6 + 9 = 15
70 + 15 = 85
23 + 42 =
65
555
+ 783
1, 338
498 + 23 =
500 + 23 = 523
523 - 2 = 521
234 + 165 =
200 + 100 = 300
30 + 60 = 90
4 + 5 = 9
300 + 90 + 9 = 399
500 + 467 =
967
678
+ 353
1, 031