Decimal

    X | 1  2  3  4  5  6  7  8  9
   ---+---------------------------
    1 | 1  2  3  4  5  6  7  8  9
    2 | 2  4  6  8 10 12 14 16 18
    3 | 3  6  9 12 15 18 21 24 27
    4 | 4  8 12 16 20 24 28 32 36
    5 | 5 10 15 20 25 30 35 40 45
    6 | 6 12 18 24 30 36 42 48 69
    7 | 7 14 21 28 35 42 49 56 63
    8 | 8 16 24 32 40 48 56 64 72
    9 | 9 18 27 36 45 54 63 72 81

Binary

    X | 0 1
   ---+-----
    0 | 0 0
    1 | 0 1