1.
Count backwards by 2s: 14, 12, 10, ___, 6, 4
2.
Count backwards by 2s: 18, 16, 14, ___, 10, 8
3.
Count backwards by 2s: 14, 12, 10, ___, 6, 4
4.
Count backwards by 3s: 18, ___, 12, 9, 6, 3
5.
Count backwards by 2s: 12, 10, ___, 6, 4, 2
6.
Count backwards by 3s: 18, 15, 12, ___, 6, 3
7.
Count backwards by 2s: 14, 12, 10, ___, 6, 4
8.
Count backwards by 2s: 14, 12, ___, 8, 6, 4
9.
Count backwards by 3s: 15, 12, 9, 6, ___, 0
10.
Count backwards by 2s: 14, ___, 10, 8, 6, 4
11.
Count backwards by 3s: 15, 12, ___, 6, 3, 0
12.
Count backwards by 3s: 27, 24, ___, 18, 15, 12
13.
Count backwards by 2s: 14, 12, 10, 8, ___, 4
14.
Count backwards by 3s: 24, 21, 18, 15, ___, 9
15.
Count backwards by 3s: 18, 15, 12, 9, ___, 3
16.
Count backwards by 2s: 12, 10, ___, 6, 4, 2
17.
Count backwards by 3s: 18, ___, 12, 9, 6, 3
18.
Count backwards by 2s: 12, 10, 8, 6, ___, 2
19.
Count backwards by 3s: 21, ___, 15, 12, 9, 6
20.
Count backwards by 3s: 24, ___, 18, 15, 12, 9