Posted by amber on .
Which property would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5?
1) commutative property of addition
2) distributive property
3) additive identity
4) additive inverse

math 
Reiny,
mentally I would do it as
27+3 + 15+5
or
30+20
You decide which properties I used.