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2. Lesson Menu Five-Minute Check (over Lesson 5–7) Main Idea and Vocabulary Example 1:Addition Equations Example 2:Subtraction Equations Example 3:Write and Solve Equations

3. Main Idea/Vocabulary I will write and solve addition and subtraction equations. defining the variable

4. Example 1 Addition Equations x + 8 = 15 Solve x + 8 = 15. 7 + 8 = 15 Answer: So, x = 7. The solution is 7. You know that 7 + 8 is equal to 15.

5. 1.A 2.B 3.C 4.D Example 1 A.4 B.5 C.9 D.15 Solve x + 5 = 9.

6. Example 2 Subtraction Equations Solve 7 – x = 4. 7 – x = 4 Write the equation. THINK 7 minus what number is equal to 4? 7 – 3 = 4 You know that 7 minus 3 is 4. Answer: So, x = 3. The solution is 3.

7. 1.A 2.B 3.C 4.D Example 2 A.3 B.4 C.5 D.6 Solve 10 – x = 6.

8. Example 3 Write and Solve Equations Tim bought a book and a magazine at the bookstore. He spent $9. If a magazine costs $3, how much did the book cost? Words Variable Expression Cost of the book plus cost of the magazine is $9. Let b represent the cost of the book. b + 3 = 9

9. Example 3 Write and Solve Equations b + 3 = 9 Write the equation. THINK What number plus 3 is equal to 9? 6 + 3 = 9 Replace b with 6 to make the equation true. Answer: So, b = 6. The cost of the book is $6.

10. Example 3 To check your solution, replace the variable with 6. Does this make the right side of the equation equal to the left side? Checkb + 3 = 9 Write the equation. Replace b with 6. 9 = 9 Simplify. The solution is correct. 6 + 3 = 9 ? Write and Solve Equations

11. 1.A 2.B 3.C 4.D Example 3 A.$2 B.$3 C.$4 D.$5 Marie bought a candy bar and a soda at the store. She spent $5. If the candy bar cost $2, how much did the soda cost?

12. End of the Lesson End Lesson

13. Resources Five-Minute Check (over Lesson 5–7) Image Bank Math Tool Chest Model Multiplication Equations

14. 1.A 2.B 3.C 4.D Five Minute Check 1 (over Lesson 5–7) A. 14 B. 1 C. 52 D. 2 Evaluate the expression. 13 – (6 × 2)

15. 1.A 2.B 3.C 4.D Five Minute Check 2 (over Lesson 5–7) A. 2 B. 7 C. 3 D. 8 Evaluate the expression. 6 + (6 ÷ 3)

16. 1.A 2.B 3.C 4.D Five Minute Check 3 (over Lesson 5–7) A. 4 B. 3 C. 2 D. 12 Evaluate the expression. (6 + 6) ÷ 3

17. 1.A 2.B 3.C 4.D Five Minute Check 4 (over Lesson 5–7) A. 2 B. 4 C. 6 D. 18 Evaluate the expression. (8 ÷ 4) × 3

18. 1.A 2.B 3.C 4.D Five Minute Check 5 (over Lesson 5–7) A. 4.3 B. 7 C. 2 D. 8 Evaluate the expression. (8 ÷ 2) + (9 ÷ 3)

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