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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 • I will write and solve addition and subtraction equations. • defining the variable Addition Equations Solve x + 8 = 15. x + 8 = 15 7 + 8 = 15 You know that 7 + 8 is equal to 15. Answer: So, x = 7. The solution is 7. Solve x + 5 = 9. A. 4 B. 5 C. 9 D. 15 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D 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. Solve 10 – x = 6. A. 3 B. 4 C. 5 D. 6 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D 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 Cost of the book plus cost of the magazine is $9. Variable Let b represent the cost of the book. Expression b+3=9 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. Write and Solve Equations To check your solution, replace the variable with 6. Does this make the right side of the equation equal to the left side? Check b+3=9 ? 6+3=9 9=9 Write the equation. Replace b with 6. Simplify. The solution is correct. 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? A. $2 B. $3 C. $4 D. $5 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D End of the Lesson Five-Minute Check (over Lesson 5–7) Image Bank Math Tool Chest Model Multiplication Equations (over Lesson 5–7) Evaluate the expression. 13 – (6 × 2) A. 14 B. 1 C. 52 D. 2 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D (over Lesson 5–7) Evaluate the expression. 6 + (6 ÷ 3) A. 2 B. 7 C. 3 D. 8 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D (over Lesson 5–7) Evaluate the expression. (6 + 6) ÷ 3 A. 4 B. 3 C. 2 D. 12 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D (over Lesson 5–7) Evaluate the expression. (8 ÷ 4) × 3 A. 2 B. 4 C. 6 D. 18 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D (over Lesson 5–7) Evaluate the expression. (8 ÷ 2) + (9 ÷ 3) A. 4.3 B. 7 C. 2 D. 8 0% 0% A B 1. 2. 3. 4. 0% C A B C D 0% D