18 - 3 x 6 =
21 - 3 x 7 =
24 - 3 x 8 =
27 - 9 x 3 =
16 - 4 x 4 =
20 - 4 x 5 =
24 - 6 x 4 =
28 - 7 x 4 =
32 - 8 x 4 =