87 ___ 86
10, 20, 30, ___
6 + 6 = ___
3 + 3 = ___
___ − 7 = 7 7 + 7 = ___
36 − 1 = ___
8 × 8 = 16
4 × 4 = 16
8 × 2 = 16
9 × 5
6 × 10