8 thoughts on “Another way to look at math

  1. Wow, you mean there’s really people who didn’t figure out this pattern on their own in the third grade?
    Just wow.

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  2. There’s also the fingers trick… put down the finger of the number (1-10) that you’re multiplying by and the remaining numbers make up the answer.

    Example (In case your teacher never taught you this either):

    4 x 9

    Look at your palms, face up
    Put down your left ring finger
    3 finger left on the left side, 6 on the right
    The answer = 36

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  3. Another thing unique about 9:
    18 1+8=9
    27 2+7=9
    36 3+6=9
    45 4+5=9
    54 5+4=9
    63 6+3=9
    72 7+2=9
    81 8+1=9
    90 9+0=9

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    • yup and it works with any number multiplied by 9. You just keep adding until you get back to 9. For example: 179 x 9 = 1611 -> 1+6+1+1 = 9, 2397 x 9 = 21573 -> 2+1+5+7+3 = 18 -> 1+8=9.

      I knew someone who said that the number 9 is the only perfect number because it is the only number you can do this with.

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