# How do you use mental math to find the sum or product and then identify the property or properties that you use to simplify (27 + 8) + 12?

##### 1 Answer
Apr 10, 2015

Mentally regroup
noting that $8 + 12 = 20$
then
$20 + 27$
equals a simple $47$

"Regrouping" uses the associative property.