1.
Count backwards by 6s: 54, 48, 42, ___, 30, 24
2.
Count backwards by 4s: 28, 24, ___, 16, 12, 8
3.
Count backwards by 6s: 30, ___, 18, 12, 6, 0
4.
Count backwards by 6s: 30, ___, 18, 12, 6, 0
5.
Count backwards by 6s: 42, ___, 30, 24, 18, 12
6.
Count backwards by 4s: 36, ___, 28, 24, 20, 16
7.
Count backwards by 5s: 25, ___, 15, 10, 5, 0
8.
Count backwards by 6s: 42, 36, 30, ___, 18, 12
9.
Count backwards by 5s: 30, 25, ___, 15, 10, 5
10.
Count backwards by 4s: 32, 28, 24, ___, 16, 12
11.
Count backwards by 4s: 20, 16, 12, ___, 4, 0
12.
Count backwards by 4s: 32, 28, 24, ___, 16, 12
13.
Count backwards by 5s: 40, ___, 30, 25, 20, 15
14.
Count backwards by 4s: 28, 24, 20, 16, ___, 8
15.
Count backwards by 5s: 40, 35, ___, 25, 20, 15
16.
Count backwards by 4s: 20, ___, 12, 8, 4, 0
17.
Count backwards by 6s: 42, 36, 30, 24, ___, 12
18.
Count backwards by 5s: 35, 30, 25, ___, 15, 10
19.
Count backwards by 6s: 36, ___, 24, 18, 12, 6
20.
Count backwards by 5s: 45, 40, 35, 30, ___, 20