Unit 1. Day 9.

Please get out paper for today’s lesson Name Date Period -------------------------------------------------------- Topic: Evaluating Expressions 7.NS.A.3 Solve real‐world and mathematical problems involving the four operations with rational numbers.

What is an expression? 3𝑥 2𝑥−1=8 6 4 −9+1 2− 1−8÷4 3 2+3=5 2− 5 2 6 4 −9+1 2− 1−8÷4 3 2+3=5 2− 5 2 A math “sentence” (without an equal sign)

Example A: −2 Evaluate the expression if 𝑎 = −2 , 𝑏 = 4, and 𝑐 = −9 4 −9 𝑎𝑏−3𝑐 − 3 −8 −3 −9 −8 +27 19

Example B*: Evaluate the expression if 𝑑 =3 , 𝑒 =−6, and 𝑓 = −8 3 −6 −8 𝑒 2 ÷𝑑−𝑓 2 2 ÷ − 36 ÷ 3 − −8 + 12 − −8 20

Example C: Evaluate the expression if 𝑥 = −8 , 𝑦 =−3, and 𝑧 =1 −8 −3 2𝑥+4 9−𝑦 2 +4 9− + 4 −16 + 9− −3 −12 12 −1

Evaluate the expression if 𝑝=4, q=−3, 𝑟=−5, 𝑠=−1, and 𝑡=6 7𝑟 − 2 𝑝 + 𝑡 𝑞 Example D: 𝑞𝑟− 𝑠 4 𝑟𝑡+𝑝𝑞 Example E:

Example D: 𝑝=4, q=−3, 𝑟=−5, 𝑠=−1, and 𝑡=6 −3 −5 6 7 − 2 + 7 − 2 + 7𝑟 − 2 𝑝 + 𝑡 𝑞 7 −5 − + 6 −3 16 −16+ 6 −3 −35 −35−16+ −2 −51 −2 −53

Example E: 𝑝=4, q=−3, 𝑟=−5, 𝑠=−1, and 𝑡=6 4 −3 −3 −5 −5 −1 6 14 + 4 −3 14 + 4 −3 𝑞𝑟− 𝑠 4 𝑟𝑡+𝑝𝑞 − 4 −30 + 14 −30+ −3 −5 − −5 6 + 4 −3 1 −12 −1 −5 6 + 4 −3 15 14 −42 14 − 1 3 −5 6 + 4 −3