Question

Which property would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5?

Answer 1

wouldn't it be easier to do this in your mind if the 27 and 3 were next to each other, and if the 15 and 5 were together?

Answer 2

Commutative and Associative Properties of Addition

Answer 3

associative property of addition

Answer 4

hmmm

Answer 5

I think just commutative...

Answer 6

\[27+15+3+5=27+3+5+15\] by the commutative law

Answer 7

well, you could use both

Answer 8

associative would mean like "add (27 + 15) + (3 + 5)" or something... it is grouping them differently, but not changing the order.

Answer 9

associative property is \((a+b)+c=a+(b+c)\) which allows you to write without parentheses, but there are no parentheses in the question