9 counters, 3 equal groups
9 ÷ 3 = 6
9 ÷ 6 = 3
9 ÷ 3 = 3
6 counters, 2 equal groups
6 ÷ 3 = 2
6 ÷ 2 = 3
6 ÷ 3 = 3
10 counters, 5 equal groups
10 ÷ 2 = 5
10 ÷ 5 = 5
10 ÷ 5 = 2
21 counters, 3 equal groups
21 ÷ 7 = 3
21 ÷ 3 = 7
16 counters, 4 equal groups
16 ÷ 4 = 4
16 ÷ 8 = 2
16 ÷ 4 = 12
16 ÷ 12 = 4