Do you know of any math problems that equal 9?

Since today was 9/9/09... my math teacher wanted us to find problems that equal nine.

ex: 65*9 =585

5+8+5= 18

1+8=9

20 Answers

  • There is an infinite amount of combinations to equal any number.

  • 2+3+4=9

  • 3 X 3 =9

  • How about the super basic one:

    1 * 9 = 9

    2 * 9 = 18 (1+8 = 9)

    3 * 9 = 27 (2+7 = 9)

    ...and so on.

  • 2+5+2 = 9

    9x3=27 and 2+7=9

    9x62 = 558; 5+5+8=18; 1+8=9

  • The sort of questions you could come up with will depend on what level of math you're taking.

    However, the trick to creating a problem like the one you used as an example is to find a number whose digits will add up to 18, 81, 333, or 90 and which is divisible by 9.

    Hope that helps.

  • 3 time 3 9#1

  • Actually any multiple of 9 follows that same pattern

    3 x 9 = 27 , 7 + 2 = 9

    36, 54, 63, 72, 81, 90, etc.

  • Well, there are millions of possible combinations what can equal 9.

    1*9=9

    3*3=9

    9/1=9

    81/9=9

    5+4=9

    square root of 81=9

    14-5=9

    1000-991

    There are millions of possiblities that you can try. Pretty much any number + or - another number can make nine.

  • 9*6=54

    5+4=9

  • 8x9=72

    7+2=9

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