## Chapter 4, Lesson 12

**4-12.A** add and subtract signed decimals**Evaluate each expression.a. **—3.1 + (—2.9)

**b.**—9.6 — (—3.8)

**4-12.B** understand how to solve addition and subtraction equations **For which equation would the Addition Property of Equality be used in the solution?(a) **

*x*+ 4 = 7

**(b)**17 = 2

*x*+ 7

**(c)**12 =

*x*— 5

**(d)**

*x*— 4 + 9 = 21

**4-12.C** rewrite subtraction equations as related addition equations

Rewrite each subtraction equation as a related addition equation.**a.** *y* — (—5) = 30 ** b.** 14 =* z* — 7