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Montgomery County Public Schools (MCPS)
Reply to "Math 2.0 Subtraction-Decomposing -- HELP"
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[quote=Anonymous][quote=Anonymous]Hi, I need to help my son and I do not understand decomposing. I know decomposition, but not this decomposing. Someone please help me! For example - the worksheet my son brought home: For the problem: 698 [u]-327[/u] The sheet asks him to fill in the blanks: _ _ _ -_ _ _ [u] _ _+_ = _ I understand decomposition: 600 + 90 + 8 minus 300 + 20 + 7. I do NOT understand the problem the way the worksheet laid it out. with the two hundreds numbers going to a ten plus a one to equal a one digit? [/quote] Are you possibly missing one blank? If so, decomposing is not about using a formula that a kid can just spit back without having any number sense. 698 is almost 700. 700 minus 300 is 400. 27 (left from the 300) minus 2 (the difference between 698 and 700) is 25. 400 plus 25 is 425. Your child can use reasoning and mental math to solve this way. Yes, I am a teacher.[/quote]
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