4,8, ..., 16, 20, ...
count on in FOURS... 12, 20
35,40, ..., ...., ....
count on in FIVES - 45, 50, 55
...,20, 30,..., 50
count on in TENS ...10, 40
5,10,15,...,...
count on in FIVES ...20, 25.
50, ..., 30,...., .....
count back in TENS ...30, 20, 10
10, 8, 6, ..., 2, ...
count back in TWOS...4, 0
1,...,3,....,5
count on in ONES ...2,3
9,...,...., 6,5
count back in ONES...8, 7
100, ..., 80, ...., ....
count back in TENS, 90, 70, 60
15,..., 13, ...., ....
count back in ONES...14, 12,11