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Montgomery County Public Schools (MCPS)
Reply to "Third grade math homework"
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[quote=Anonymous][quote=Anonymous]This is the engineer who solved the problem using algebra. My husband solved it differently; he feels the problem is more "logic" than math. Add the totals up: D + K = 81 D + M = 96 K + M = 93 ---------------- = 270 Since each kid is double counted above, divide by 2 to find the total number of cards. Once you have the total, subtract out the known amounts above to find the missing amount: D + K + M = 135 We already know that D + K = 81 So subtract 135 - 81 = 54 Mike = 54 You can do the rest.... We have wicked smart kids:)[/quote] Op here. I e-mailed the teacher who said she primarily wanted to see the thought process. When DD got home, I asked her what if she added up all the sums to try to find the total number of cards. She said, "but each boy is double counted, so I would have to divide by 2," and then it all seemed to click. She followed the process you describe here, and got the answers.[/quote]
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