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          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

 

 

 

 

          H T U       H T U       H T U       H T U

          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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