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[quote=Anonymous][quote=Anonymous][quote]
No. Not hard to measure. You measure it like this: 8 + ? =10 And if the student can figure out that ? = 2, then the student understands. [/quote]

This is a very hard concept for many, many first graders.  Doing this with objects they understand.  On paper, it is extremely difficult.

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This is an extraordinarily easy concept to teach to 1st grade students.  The thing is, first you have to teach it to the kids.   That takes a few weeks.  Yes, you can use manipulatives. Then you move to pacture representation of the concept (you could use a 10 frame with 8 red dots and ask the kids... how many more dots are needed to fill in the 10 frame?)   Finally you teach them that 8 and 2 are "number bonds" that go together to make 10.  You can play all sorts of number bond games to help kids remember that the number bonds that make 10 are 1+9 2+8 3+7 4+6 and 5+5.

it's quite an easy concept, and once theyhave mastered the number bonds that make ten, answering questions like _____ +8 = 10 becomes very very very very simple!

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