Sandy Wood
Brain Game: Math Square #11
by Sandy Wood - February 8, 2010 - 7:30 AM

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The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid. Two of these numbers are already provided for you. Place the other digits in the correct spots so that the mathematical equations work both across and down. IMPORTANT: Remember algebraic rules when solving the problems… multiplication and division should be performed in the first step, then addition and subtraction in the second. Good luck!

mathsq-11-q

Here is the SOLUTION.

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Comments (10)

  1. Nice way to ease my way back into the work week. I think these are my favorites. :)

    posted by Carol on 2-8-2010 at 9:25 am

  2. 7 + 2 x 9 = 25 ??

    posted by Andy on 2-8-2010 at 10:27 am

  3. Multiplication comes before addition. 2×9=18, 18+7=25

    posted by Mark on 2-8-2010 at 10:49 am

  4. Somebody buy Andy your order of operations t-shirt:

    http://www.mentalfloss.com/store/product.php?productid=16400&cat=103&page=1

    posted by Roger on 2-8-2010 at 10:52 am

  5. How about:
    5 + 7 x 4
    6 x 2 + 2
    3 + 9 + 4
    This seems to work…but perhaps I am missing something.

    posted by Donna on 2-8-2010 at 11:31 am

  6. Donna,
    You are missing a couple of vital rules: You have to use 1 thru 9 and only use them once.

    posted by DJ on 2-8-2010 at 12:01 pm

  7. Sorry Donna the idea is the numbers 1-9 used only once I believe.

    posted by KevinGA on 2-8-2010 at 12:03 pm

  8. Well, it looks like I got an A for simple math, but an F for following instructions! Thanks guys for the clarification! ( :

    posted by Donna on 2-8-2010 at 1:32 pm

  9. Really? I don’t remember learning that in an equation, you do multiplications first… I’ll have to call my math teachers and yell at them!

    posted by Jung on 2-8-2010 at 3:37 pm

  10. Jung, Yes you do. Please Excuse My Dear Aunt Sally.

    posted by MathTeacher on 2-11-2010 at 10:20 am

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