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Sandy Wood
Brain Game: Math Square #2
by Sandy Wood - October 29, 2009 - 7:30 AM

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We offered our first Math Square last week, and the positive response led us to bring it back again for today’s Brain Game. Enjoy!

The nine squares that make up the main grid should be filled with the digits 1 through 9. Each digit should appear only once in the mail grid. Two numbers (5 and 7) are already provided for you. Place the other digits in the correct spots so that the mathematical equations work both across and down. (Remember your algebraic rules when solving the problems… multiplication and division should be solved first, then addition and subtraction.) Good luck:

math square no. 2

Here is the SOLUTION.

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Comments (15)

  1. I like these, I think this one was easier than the last one though!

    posted by Patrick on 10-29-2009 at 8:24 am

  2. Something about numbers. So reliable. So consistant. Love these puzzles.
    Keep them coming. Great job on these Sandy.

    posted by KevinGA on 10-29-2009 at 8:38 am

  3. I got it before 8am. Yay. I do like these. Challenging, but not impossible.

    CAPTCHA: lizard yourself

    posted by Nick on 10-29-2009 at 8:52 am

  4. This works, too:

    9 x 4 – 24 = 12
    - + x
    2 x 7 + 2 = 16
    + – /
    5 + 7 – 4 = 8
    = = =
    12 3 12

    posted by BJ on 10-29-2009 at 9:12 am

  5. I like these puzzles. They aren’t hard, but they really get your mind working.

    posted by Bill on 10-29-2009 at 9:16 am

  6. In response to BJ’s alternative solution, are you allowed to have multiples of numbers? I was under the impression that you could only have one of each number between 1 and 9, but the directions aren’t completely clear on that.

    posted by Rita on 10-29-2009 at 9:29 am

  7. More, please!

    posted by Nora on 10-29-2009 at 9:47 am

  8. I don’t think BJ’s works. The middle column down would be 4+7-7=3.

    posted by jj on 10-29-2009 at 9:52 am

  9. BJ, your response isn’t right even with your numbers. your middle column down reads 4+7-7=3.

    posted by Thomas on 10-29-2009 at 9:53 am

  10. I don’t think BJ’s solution works. The middle column down would be: 4+7-7=3

    posted by jj on 10-29-2009 at 9:55 am

  11. Rita, you’re correct – each digit from 1 to 9 can only appear once in the middle part of the puzzle. I’ll revisit the instructions to see if there’s a way to make that clearer.

    UPDATE: I added an extra line in the instructions to ensure readers know that each digit 1 through 9 appears only once in the main grid. Thanks for the suggestion!

    posted by Sandy Wood on 10-29-2009 at 10:05 am

  12. Thanks for the kind comments, everyone. Looks like we’ll have to make this a once-a-week addition to the expanding mix of puzzles.

    posted by Sandy Wood on 10-29-2009 at 10:10 am

  13. love these! this one was a bit easier than the last, but still fun

    posted by Ian from Baltimore on 10-29-2009 at 11:09 am

  14. Er, BJ, in what way do you consider yours a viable solution? First, 24 is not a legal number. Second, several of your rows and columns do not, in fact, total up to the right numbers.

    posted by Lugh on 10-29-2009 at 12:33 pm

  15. As a math dunderhead, I usually prefer word puzzles. But these are just perfect for me – easily solvable, but requiring a little bit of calculation. Good job!

    posted by Kelly on 10-29-2009 at 3:10 pm

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