H T U H T U H T U H T U
3 4 1 7 2 3 5 3 9 1 2 4
+ 5 2 2 + 1 5 5 + 2 4 0 + 4 3 5
7 8 3 9 3 4 5 0 1 6 2 8
+ 1 0 3 + 5 3 + 4 8 2 + 2 3 0
Challenge
Count in 3s up to 36. Can you now count back in 3s from 36?
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