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OpenStudy (anonymous):
Use Associative and Commutative to find each sum or Product- (87 x 5) x 2
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OpenStudy (jlastino):
87 x5 = 435 435 x 2= 870
OpenStudy (jlastino):
Since its multiplication you can also multiply 5 by 2 first 5x2 =10 Then multiply it to 87 87 x 10 = 870 The commutative property of multiplication applies here
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