Using Properties to Add and Subtract Efficiently

Subject: Math

Chapter: Adding and Subtracting Rational Numbers

CCSS Alignment: 7.NS.A.1.a, 7.NS.A.1.b, 7.NS.A.1.c...

Adam is adding up sales and refunds at a school snack stand. Instead of working through a long list in order, Adam can use math properties to work faster.

First, the commutative property of addition says numbers can be added in any order.

For example, sales of $6.50 and $3.50 can be added in any order.

Next, the associative pro...