Warm Up

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Warm Up
Problem of the Day
Lesson Presentation
Lesson Quizzes
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Warm Up Solve each equation. 1. x 7 22 2. 18
x 105 3. 16 x 9 4. 23 x 4
x 15
x 87
x 7
x 19
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Problem of the Day Bruce has 25 CDs remaining
after giving 14 to John, 17 to Mary, and 25 to
Sue. How many CDs did he begin with?
81
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Learn to solve whole-number subtraction
equations.
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When Theodore Roosevelt became president of the
United States, he was 42 years old. He was 27
years younger than Ronald Reagan was when Reagan
became president. How old was Reagan when he
became president?
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Let a represent Ronald Reagans age.
Ronald Reagans age
Theodore Roosevelts age




a
27
42
a 27 42
a 69
Ronald Reagan was 69 years old when he became
president.
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Additional Example 1A Solving Subtraction
Equations
Solve y 23 39. Check your answer.
Add 23 to both sides to undo the subtraction.
y 62
Check y 23 39
Substitute 62 for y in the equation.
62 is the solution.
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Additional Example 1B Solving Subtraction
Equations
Solve 78 s 15. Check your answer.
Add 15 to both sides to undo the subtraction.
93 s
Check 78 s 15
Substitute 93 for s in the equation.
93 is the solution.
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Additional Example 1C Solving Subtraction
Equations
Solve z 3 12. Check your answer.
Add 3 to both sides to undo the subtraction.
z 15
Check z 3 12
Substitute 15 for z in the equation.
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15 is the solution.
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Check It Out Example 1A
Solve a 4 7. Check your answer.
Add 4 to both sides to undo the subtraction.
a 11
Check a 4 7
Substitute 11 for a in the equation.
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11 is the solution.
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Check It Out Example 1B
Solve 57 c 13. Check your answer.
Add 13 to both sides to undo the subtraction.
70 c
Check 57 c 13
Substitute 70 for c in the equation.
70 is the solution.
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Check It Out Example 1C
Solve g 62 14. Check your answer.
Add 62 to both sides to undo the subtraction.
g 76
Check g 62 14
Substitute 76 for g in the equation.
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76 is the solution.
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Lesson Quizzes
Standard Lesson Quiz
Lesson Quiz for Student Response Systems
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Lesson Quiz
1. x 9 21 2. 14 x 3 3. x 7 11 4. 16
x 14 5. x 9 11
x 30
x 17
x 18
x 30
x 20
6. Susan is taller than James. The difference in
their height is 4 inches. James is 62 inches
tall. How tall is Susan?
66 inches
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Lesson Quiz for Student Response Systems
1. Solve the equation x 17 36. A. x 19 B.
x 21 C. x 36 D. x 53
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Lesson Quiz for Student Response Systems
2. Solve the equation 20 x 6. A. x 14 B.
x 20 C. x 26 D. x 40
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Lesson Quiz for Student Response Systems
3. Solve the equation y 16 33. A. y 59 B.
y 49 C. y 23 D. y 17
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Lesson Quiz for Student Response Systems
4. Solve the equation 52 y 23. A. y 29 B.
y 31 C. y 75 D. y 84
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Lesson Quiz for Student Response Systems
5. Solve the equation x 15 22. A. x 43 B.
x 37 C. x 13 D. x 7
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Lesson Quiz for Student Response Systems
6. During an NBA playoff game, Brand scored 12
points more than Cassell. If Cassell had 33
points how many points did Brand score? A. 45
points B. 33 points C. 21 points D. 12 points