# What are we going to do? CFU Students, you already know how to identify variable terms and constant terms in an expression. Now, we will identify like.

## Presentation on theme: "What are we going to do? CFU Students, you already know how to identify variable terms and constant terms in an expression. Now, we will identify like."— Presentation transcript:

What are we going to do? CFU Students, you already know how to identify variable terms and constant terms in an expression. Now, we will identify like terms in an expression to add and subtract expressions. Make Connection We will add and subtract expressions. Learning Objective Activate Prior Knowledge Identify variable terms (underline) and constant terms (circle) in the expressions. 1. (3 x  6)  (-5 x  11) 2. (4 d  10)  (6 d  5)

CCSS 7 th Grade Expressions and Equations 1.1 Add and subtract expressions. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Skill Development/Guided Practice (continued) Rewrite the expressions as the sum of all terms. Identify like terms in the expressions. (underline and circle) Combine like terms. Hint: Add each like term. Interpret equivalent expressions. “____ is equivalent to ____” Add and subtract expressions. 1 2 3 4 How did I/you rewrite the expressions? How did I/you identify like terms? How did I/you combine like terms? CFU 1 2 3 Adding and subtracting expressions is to combine like terms. Adding and subtracting expressions creates equivalent expressions. 5. (8 k  2)  (4 k  6) 6. (5 m  6)  (10 m  7) 7. (11 b  5)  (-12 b  2)  (4 b  3) 8. (4 q  5)  (9 q  1)  (-12 q  13) 8 k  (-2)  (-4 k )  (-6) 4k4k  (-8) 4 k  8 “(8k – 2) – (4k + 6) is equivalent to 4k – 8” 5 m  6  (-10 m )  7 -5 m  13 “(5m + 6) – (10m – 7) is equivalent to -5m + 13” 11 b  5  (-12 b )  (-2)  (-4 b )  (-3) -5 b  0 -5 b “(11b + 5) + (-12b – 2) – (4b + 3) is equivalent to -5b” 4 q  5  (-9 q )  1  (-12 q )  13 -17 q  19 “(4q + 5) – (9q – 1) + (-12q + 13) is equivalent to -17q + 19” Like Terms 3 x and -5 x 6 and -11

CCSS 7 th Grade Expressions and Equations 1.1 Add and subtract expressions. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Periodic Review 1 1. 7 b  5  (6 b  3) 2. 6 c  10  (-4 c  7)  (-9 c  3) 3. (9 f  8)  (5 f  12) 4. (9 q  3)  (6 q  11) 5. 2 k  8  (13 k  2) 6. (8 y  11)  ( y  11)  (-7 y  8) 13 b  2 11 c 4 f  203 q  14 15 k  6 30

CCSS 7 th Grade Expressions and Equations 1.1 Add and subtract expressions. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Periodic Review 2 Access Common Core 1. (9 z  10)  (5 z  11) 2. - 7 x  12  (9 x  4)  (10 x  6) 3. 5 h  5  (7 h  1) 4. 8 y  8  (- y  8) 14 z  1-8 x  14 -2 h  6 7 y  16 Describe and correct each error made in adding and subtracting expressions below. 1. A (-5 x  20)  (4 x  3) B (8 a  2)  (6 a  1) -9x – 232a – 3 3.A (7 m  7)  (8 m  4)B (-4 y  9)  (2 y  6) 4m4m -6y – 3 2.A (-10 h  5)  (8 h  1)B (3 k  8)  (4 k  10) 4h4h5k5k

CCSS 7 th Grade Expressions and Equations 1.1 Add and subtract expressions. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Periodic Review 3 Access Common Core 1. What is the perimeter of the quadrilateral? __________________________________________________ 2 m  1 2 m  5 3m3m 5 The perimeter of the quadrilateral is 7 m  9. 1. Choose Yes or No to indicate whether each expression is equivalent to 20 h  12. A(18 h  12)  2 h B(25 h  7)  (5 h  5) C(13 h  3)  (7 h  15) D(17 h  6)  (-3 h  6) O Yes O No 2. Choose Yes or No to indicate whether each expression is equivalent to -18 p  9. A(-21 p  5)  (-3 p  4) B(-14 p  9)  2 p C(-7 p  1)  (-11 p  10) D(-13 p  5)  (5 p  4) O Yes O No 3. Choose Yes or No to indicate whether each expression is equivalent to 5 d  11. A(-2 d  5)  (-7 d  6) B(13 d  3)  (8 d  8) C(-6 d  4)  (11 d  7) D(8 d  11)  3 d O Yes O No

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