math 4th grade
posted by isaac .
Lance wants to find the total length of 3 boards. He uses the expression 3 1/2 + (2+ 4 1/2). How can Lance rewrite the expression using both the Associative and Commutative Properties of Addition?

3 1/2 + (2+ 4 1/2)
3 1/2 + 4 1/2 + 2
3 + 1/2 + 2 + 4 + 1/2
3+2+4 + 1/2 + 1/2
9 + 1
10
or, you can rearrange the numbers in other ways. 
18

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12+12=35
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