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Transcript 
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
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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
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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
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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
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(over Lesson 5–7)
Evaluate the expression.
6 + (6 ÷ 3)
A. 2
B. 7
C. 3
D. 8
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(over Lesson 5–7)
Evaluate the expression.
(6 + 6) ÷ 3
A. 4
B. 3
C. 2
D. 12
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(over Lesson 5–7)
Evaluate the expression.
(8 ÷ 4) × 3
A. 2
B. 4
C. 6
D. 18
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(over Lesson 5–7)
Evaluate the expression.
(8 ÷ 2) + (9 ÷ 3)
A. 4.3
B. 7
C. 2
D. 8
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