problem
|
strategy
|
answer
|
13 x 5
|
10 x 5 = 50
3 x 5 =15
50 + 15 = 65
|
65
|
19 x 6
|
10 x 6 = 60
9 x 6 = 54
54 + 60 =114
|
114
|
15 x 7
|
10 x 7 =70
5 x 7 = 35
35 + 70 = 105
|
105
|
18 x 6
|
10 x 6 = 60
8 x 6 = 48
60 + 48 = 108
|
108
|
14 x 9
|
10 x 9 = 90
4 x 9 = 36
90 + 36 = 126
|
126
|
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