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Montgomery County Public Schools (MCPS)
Reply to "Third grade math homework"
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[quote=Anonymous][quote=Anonymous]I don't think they want trial and error:( There is an easier way to solve this problem - Solve two equations simultaneously: M+K = 93 D+K = 81 You want to get rid of the Ks so you multiply the last equation by - 1 then have: M+K = 93 -D-K = -81 then add together the two equations (the Ks are eliminated) M-D = 93-81 M-D = 12 D = M-12 Plug this in to the first equation (D+M = 96): M-12 + M = 96 2M = 108 M = 54 Then plug this figure in to get the other numbers. I'm an engineer and this is how it should be explained.[/quote] Thanks. 9:50's version easier to follow for a kid I think. [/quote]
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