63
74
77
85 90
99
97 - 5 73 + 6 88 - 6
65 + 3
68 7478 - 4
8781 + 6
92 79 82
50 + 10
= 60
50 + 20
= 70
20 + 20
= 40
20 + 20 + 10 = 50
50 + 50
= 100
30
60
40
70
50
100
80
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