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Montgomery County Public Schools (MCPS)
Reply to "Third grade math homework"
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[quote=Anonymous][quote=Anonymous]DD brought home this problem. They have not been taught how to solve it in class, and I can't remember how. Dustin and Michael together have 96 baseball cards. Michael and Kevin to together have 93 cards. Dustin and Kevin together have 81. How many cards does each boy have? There is a bonus question too, but I can't recall what it is. Any ideas how to figure this out? [/quote] D + M = 96 M + K = 93 D + K = 81 You can multiply the last line by -1 on both sides, so: D + M = 96 M + K = 93 -D - K = -81 Add all of them together and you get: -D + D = 0 M + M = 2M K + -K = 0 96 + 93 - 81 = 108 So, 2M = 108, M = 54. Substitute back and you get D = 42 and K = 39. This is how I would do it. I have NO idea of the process that they would teach to a 3rd grader. These are problems similar to the ones my daughter got in an HGC last year in 4th.[/quote]
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