1. Splash Screen

2. Solve addition and subtraction equations.
Main Idea/Vocabulary

3. KC 1

4. Solve Addition Equations
Solve 14 + y = 20. Check your solution.
14 + y = 20 Write the equation.
–14 –14 Subtract 14 from each side.
y = 6 Simplify.
Answer: The solution is 6.
Check 14 + y = 20 Write the original equation. ?
= 20 Replace y with 6.
20 = 20  The sentence is true.
Example 1

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

6. Solve Addition Equations
Solve a + 7 = 6. Check your solution.
a + 7 = 6 Write the equation.
–7 –7 Subtract 7 from each side.
a = –1 Simplify.
Answer: The solution is –1.
Check a + 7 = 6 Write the original equation. ?
–1 + 7 = 6 Replace a with –1.
6 = 6  The sentence is true.
Example 2

7. Solve m + 9 = 22. A. 11 m + 9 = 22 B. 13 –9 –9 C. 14 m = 13 D. 9 A B C
–9 –9
m = 13 A B C D
Example 2

8. Words A grapefruit is 6 ounces more than an apple.
FRUIT A grapefruit weighs 11 ounces, which is 6 ounces more than an apple. How much does the apple weigh?
Words A grapefruit is 6 ounces more than an apple.
Variable Let x = the weight of an apple.
Equation 11 = 6 + x
Example 3

9. –6 –6 Subtract 6 from each side.
11 = 6 + x Write the equation.
–6 –6 Subtract 6 from each side.
5 = x Simplify.
Answer: An apple weighs 5 ounces.
Example 3

10. EXERCISE Cedric ran 17 miles this week, which is 9 more miles than he ran last week. How many miles did he run last week?
A. 6 miles
B. 7 miles
C. 8 miles
D. 26 miles
17 = x + 9
– –9
8 = x A B C D
Example 3

11. KC 2

12. Solve a Subtraction Equation
Solve 12 = z – 8. Check your solution.
12 = z – 8 Write the equation.
Add 8 to each side.
20 = z Simplify.
Answer: 20
Check Since 12 = 20 – 8, the solution is correct. 
Example 4

13. Solve w – 5 = 27. A. 22 w - 5 = 27 B. 32 +5 +5 C. 30 w = 32 D. 24 A B
w = 32 A B C D
Example 4

14. Variable Let x = her brother’s practice time.
MUSIC Vivian practiced the piano for 32 minutes. She practiced 11 minutes less than her brother. How long did her brother practice the piano?
Words Vivian’s practice time is 11 minutes less than her brother’s practice time.
Variable Let x = her brother’s practice time.
Equation 32 = x – 11
Example 4

15. Answer: Vivian’s brother practiced for 43 minutes.
32 = x – 11 Write the equation.
Add 11 to each side.
43 = x Simplify.
Answer: Vivian’s brother practiced for 43 minutes.
Example 5

16. WEATHER The high temperature today is 51°F
WEATHER The high temperature today is 51°F. This is 13° less than the high temperature yesterday. Find the high temperature yesterday.
A. 38°F
B. 45°F
C. 51°F
D. 64°F
51= x - 13
64 = x A B C D
Example 5

17. End of the Lesson
End of the Lesson