19 April 2014

177. Number Puzzle: 9-8=15: Move 1

Easy Medium Hard Extreme


Move only 1 stick to make the equation true.

20 comments:

  1. Other answers:
    9-6≠15, 9-9≠15, 9-0≠15

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  2. I got it right. But before I got to the right answer, I noted two alternative solutions:

    9-0 =/= 15 (Take match from 8 to make a 0, and use it to make a slash over the = sign to signify "not equal to". The rules never specified that the matches had to be perfectly vertical or horizontal.)

    Also, 4-8 =/= 15 (same principle; turn 9 into 4).

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    Replies
    1. Turn a 9 in to a 4 by only removing one ????? The viable answers are 9-8 9-9 q -8 9-6 9+6 98 ... I'm sure there are a few other dose not = answers but you can't turn that 9 in to a 4 by removing just one match

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    2. The fact that the question uses the term equation means that your "not equal to" answers are not correct. You are making inequalities, not equations.

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  3. Change the 8 into a 6 by removing the top left matchstick. Use that matchstick to change the minus into a plus. 9 + 6 = 15.

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  4. turn the 8 into a 6 by removing the right top candle and use it to form a plus, replacing the minus to the right of the 9

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  5. Uh, he moved 2 sticks. Why am I here....

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  6. Or you can remove the minus sign between 9 and 8 making it 98 ≠ 15 which is also a true statement.

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  7. 9 - 8 =/= 15 doesn't fit the definition of an equation. So, while that is simple, you are making an inequality, not an equation.

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  8. Push the left side of the top stick on the equals down to make a < sign. 9-8<15.

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  9. When y'all make the = into a ≠ or a <, it's not an EQUATION any more, so you haven't "made the equation true." The right answer is among the above comments.

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  10. 9-8 work shift is 13 hours...

    9-8 = 13 (move 1 stick top left of 15 to the top right)

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  11. Oh with one matchstick move only
    1+9=8+8

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  12. Remove a match stick from the top of the 5, and use it to light the rest of the match sticks on fire. When the 5 burns away, you have 9-8=1 and technically, you only moved one stick.

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