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?

Steve
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. 
James
18

Graciela Claus
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HOSE
12+12=35

Anonymous
4 1/2(2+4 1/2

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5 1/2+ 4 1\2 = 10 There
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Lance wants to find the total length of three boards he use the special 3 1/2 + 2 + 4 1/2 how can Lance rewrite the expression using both the associative and commutative properties of addition