1. Splash Screen

2. Five-Minute Check (over Lesson 3–5) Main Idea
Example 1: Multiply Decimals
Example 2: Multiply Decimals
Example 3: Annex Zeros in the Product
Example 4: Annex Zeros in the Product
Example 5: Multiply by 10, 100, or 1,000
Lesson Menu

3. Estimate and find the product of decimals and whole numbers.
Main Idea/Vocabulary

4. Since the estimate is 76, place the decimal point after the 5.
Multiply Decimals
Find 18.9 × 4.
Method 1 Use estimation.
Round 18.9 to 19.
18.9 × 4 → 19 × 4 or 76 3 3
18.9 × 4
Since the estimate is 76, place the decimal point after the 5. 7 5 . 6
Example 1

5. Method 2 Count decimal places.
Multiply Decimals
Method 2 Count decimal places. 3 3
18.9 × 4
one decimal place 7 5 . 6
Count one decimal place from the right.
Answer: 75.6
Example 1

6. Find 12.6 × 8. A B C
D. 1,008 A B C D
Example 1

7. Since the estimate is 3.5, place the decimal point after the 3.
Multiply Decimals
Find 0.56 × 7.
Method 1 Use estimation.
Round 0.56 to 0.5.
0.56 × 7 → 0.5 × 7 or 3.5 4
0.56 × 7
Since the estimate is 3.5, place the decimal point after the 3. 3 9 . 2
Example 2

8. Method 2 Count decimal places.
Multiply Decimals
Method 2 Count decimal places. 4
0.56 × 7
two decimal places 3 9 . 2
Count two decimal places from the right.
Answer: 3.92
Example 2

9. Find 0.83 × 4. A
B. 3.32
C. 33.2
D. 332 A B C D
Example 2

10. Annex Zeros in the Product
Find 3 × 1
0.016 × 3
three decimal places 0. 4 8
Annex a zero on the left of 48 to make three decimal places.
Answer:
Example 3

11. Find 4 × A
B. 0.92
C. 9.2
D. 92 A B C D
Example 3

12. Annex Zeros in the Product
ALGEBRA Evaluate 5g if g =
5g = 5 × Replace g with ×
four decimal places
0.0455
Annex a zero to make four decimal places.
Answer:
Example 4

13. ALGEBRA Evaluate 3x if x = 0.0062.
C. 1.86
D. 18.6 A B C D
Example 4

14. Method 1 Use paper and pencil.
Multiply by 10, 100, or 1,000
MENTAL MATH Find 3.25 × 100.
Method 1 Use paper and pencil.
100 × 3.25
two decimal places +
325.00
two decimal places
Answer:
Example 5

15. Multiply by 10, 100, or 1,000 Method 2 Use mental math.
Move the decimal point to the right the same number of zeros that are in 100, or 2 places.
3.25 × 100 = 3.25
Answer: 325
Example 5

16. MENTAL MATH Find 2.4 × 1,000. A. 24 B. 240 C. 2,400 D. 24,000 A B C D
Example 5

17. End of the Lesson
End of the Lesson

18. Five-Minute Check (over Lesson 3–5) Image Bank Math Tools
Modeling Decimals
Dividing Decimals
Modeling Decimals
Resources

19. Find 8.7 + 11.5. 19.2 20.1 20.2 21.2 (over Lesson 3-5) A B C D
Five Minute Check 1

20. Find 17.15 + 12.96. 29.11 29.95 30.06 30.11 (over Lesson 3-5) A B C D
Five Minute Check 2

21. Find 7.5 – 4.1. 3.4 3.6 4.4 5.6 (over Lesson 3-5) A B C D
Five Minute Check 3

22. Find 34.64 – 27.18. 7.22 7.46 7.72 8.56 (over Lesson 3-5) A B C D
Five Minute Check 4

23. Evaluate the expression a – b if a = 105.8 and b = 95.9.
(over Lesson 3-5)
Evaluate the expression a – b if a = and b = 95.9.
8.9
9.7
9.9
10.3 A B C D
Five Minute Check 5

24. (over Lesson 3-5)
Based on the information in the table, how much greater was Michael Young’s batting average than Jose Reyes’ batting average?
.058
.055
.041
.028 A B C D
Five Minute Check 5

25. End of Custom Shows