 # Splash Screen.

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Splash Screen

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

End of the Lesson End of the Lesson

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

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

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

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

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

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

(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

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