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Montgomery County Public Schools (MCPS)
Reply to "Third grade math homework"
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[quote=Anonymous](Not the PP.) Draw a bar. Give it a value of 96. Divide it somewhere. Label one part M and one part D. Stick another bar onto the end of it. Give it a value of 93. Divide it somewhere. Label one part M and one part K. Now you have a long bar, divided in four parts, labeled M, D, M, K, with a value of 96+93=189. Now you know what D+K is, namely 81. So shuffle the pieces around in the bar so that you have four parts, labeled M, M, D, K. The two parts labeled D and K, combined, have a value of 81. So the two remaining parts, labeled M and M, have a value of 189-81=108. If M+M=108, then M=54. And then you can figure out the other ones. (I'm the PP who's a fan of bar models, not the PP who came up with the bar-model solution.)[/quote]
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