H T U H T U H T U H T U
3 4 5 7 2 4 8 2 7 5 3 9
+ 1 2 8 + 2 1 8 + 1 6 6 + 2 4 9
2 8 3 4 5 1 6 9 4 7 5 5
+ 3 4 1 + 2 7 5 + 1 5 4 + 1 8 2
Challenge
Count in 3s up to 60. Can you now count back in 3s from 60?
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