The ability to use mental math is an invaluable skill that will be used again and again throughout life. I don't know about you, but I wish someone would have done more with this skill when I was a kid!
I included 20 pairs of math problems that equal 100. I suggest that you not use all of the cards at once. I started out with 10 pairs of the easier problems, and then switched the cards out. 40 cards is too many to remember!
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