math for elemetary school teachers

need to create a number system using only: A=1, B=2, C=3, D=4 and Zero=0. Help

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  1. 0
    1
    2
    3
    4

    1 0 = 5 = 5^1 + 0
    1 1 = 6 = 5^1 + 1
    1 2 = 7 = 5^1 + 2
    1 3 = 8
    1 4 = 9

    2 0 = 10 = 2*5^1 + 0 *5^0
    2 1 = 11 = 2*5^1 + 1 *5^0
    2 2 = 12 = 2*5^1 + 2 *5^0
    etc
    ...
    2 3 1 = 70 = 2*5^2 + 3*5^1 + 1*5^0

    Now put in A for 1, B for 2, C for 3 etc
    so for example
    2 3 1 is B C A

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    2. 👎 0
  2. 2 3 1 = 66 = 2*5^2 + 3*5^1 + 1*5^0

    Now put in A for 1, B for 2, C for 3 etc
    so for example
    2 3 1 is B C A

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    2. 👎 0

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