Sandy Wood
Brain Game: Math Square #15
by Sandy Wood - March 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-15-q

Here is my SOLUTION.

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Comments (10)

  1. Sweet. Love the math squares. This one I was able to work out in my head with only 1 cup of coffee. Good wake up.

    posted by KevinGA on 3-8-2010 at 7:56 am

  2. Wow, I was able to do this one entirely in my head!

    posted by Ryan on 3-8-2010 at 8:06 am

  3. yeah, that one was easy

    posted by Rod on 3-8-2010 at 10:34 am

  4. Shouldn’t multiplication be figured before division? If so, then the vertical equation on the far left is inaccurate. That is what kept tripping me up.

    posted by Ali-G on 3-8-2010 at 12:25 pm

  5. @ Ali-G… Multiplication and division are considered to be at the same level in the order of operations. When you have a bunch of operations of the same level, you just operate from left to right (or top to bottom in this example).

    posted by DTG on 3-8-2010 at 1:37 pm

  6. The first line tripped me up …
    6+7×9=117 not 69
    If I work back 69 is not divisible by 9. I must be getting something wrong…

    posted by Jerome on 3-8-2010 at 1:47 pm

  7. Jerome Read the post by DTG. Order of Operation is a factor.

    posted by James on 3-8-2010 at 3:52 pm

  8. I was always taught the acronym \BEDMAS\ for the order of operations. That is, Brackets, Exponents, Division, Multiplication, Addition, Subtraction. It helps with these!

    posted by apple on 3-8-2010 at 8:31 pm

  9. In 7th grade algebra (so long ago now), I remember being taught \Please Excuse My Dear Aunt Sally\ which meant PEMDAS or Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

    posted by Melissa on 3-8-2010 at 10:08 pm

  10. No such distinction between mult/div and add/sub. They are equivalent in mathematical operations.

    Though if you reformulate the acronym, you wind up with something out of Star Wars. “Please Excuse M/D A/S”

    posted by grover on 3-9-2010 at 5:14 am

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