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Cake day: June 29th, 2020

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  • DougtoAsklemmy*Permanently Deleted*
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    4 years ago

    Most multiplication tables of 1-11 follow a pattern (Excluding 3 and 7). This helps me to know how a number might be divisible by something, or help me remember a multiplication table if I forget it.

    • 1: Pretty obvious
    • 2: The one’s place digit will end in 0, 2, 4, 6, 8
    • 4: The one’s place digit only goes in the order of 0, 4, 8, 2, 6
    • 5: The one’s place digit can only be 0 or 5
    • 6: The one’s place digit can only be 0, 6, 2, 8, 4
    • 8: Follows the one’s place digit restriction of 4, just in a different pattern.
    • 9: Where N < 10, adding (N * 9)'s digits together will always make 9.
    • 10: The one’s digit is always 0
    • 11: Where N < 10, (N * 11)'s digits are always the same.
    • 12: Where N < 5, (N * 12)'s one’s digit is double the ten’s digit.