Diffy is great for practicing subtraction - but it also requires
students to think logically and identify patterns. It can be played with
integers, negative numbers, fractions, decimals, and money, but I think
it is most fun with whole numbers. Great for kids, but adults enjoy
playing too.
Begin by writing four different numbers into the four circles on each of
the outer corners. Fill in the outer squares by subtracting the
smaller number from the larger number on each corner. Continue working
toward the center, subtracting the corners. What patterns do you see?
Can you get to the middle without a difference of zero?
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| Image created by Rachel Lynette Copyright ©2011 all rights reserved |
Here is a completed one. As you can see, the player (who
was me) did not win because the circles furthest to the center all came
up zero. Can you win? Can your students? And perhaps more importantly,
what will your students learn about number relationships while they are
trying?
click in here to try the games 
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