64 : 8;
72 : 9;
81 : 9;
56 : 8;
7 * 7;
8 * 8;
9 * 9;
6 * 6;
(36 − 28) * 5;
4 * (23 − 16);
(32 − 27) * 6;
5 * (64 − 60);
36 + 24 : 6;
45 : 5 * 9;
18 + 54 : 9;
32 : 4 * 8.
64 : 8 = 8;
72 : 9 = 8;
81 : 9 = 9;
56 : 8 = 7;
7 * 7 = 49;
8 * 8 = 64;
9 * 9 = 81;
6 * 6 = 36;
(36 − 28) * 5 = 8 * 5 = 40;
4 * (23 − 16) = 4 * 7 = 28;
(32 − 27) * 6 = 5 * 6 = 30;
5 * (64 − 60) = 5 * 4 = 20;
36 + 24 : 6 = 36 + 4 = 40;
45 : 5 * 9 = 9 * 9 = 81;
18 + 54 : 9 = 18 + 6 = 24;
32 : 4 * 8 = 8 * 8 = 64.