Main Idea Example 1 Multiply Decimals Example 2

Main Idea Example 1: Multiply Decimals Example 2: Multiply Decimals Example 3: Annex Zeros in the Product Example 4: Real-World Example

• Estimate and find the product of decimals and whole numbers.

Multiply Decimals Find 2 × 0. 45. Estimate 2 × 0. 5 = 1. 0 0. 45  two decimal places × 2  0. 90 Place the decimal point two places from the right. Answer: 2 × 0. 45 = 0. 90 Check for Reasonableness 0. 90 ≈ 1. 0

Find 5 × 0. 75. A. 0. 375 B. 3. 75 C. 37. 5 D. 375

Multiply Decimals Find 4 × 18. 9. Estimate 4 × 20 = 80 18. 9  one decimal place × 4  75. 6 Place the decimal point one place from the right. Answer: The product is 75. 6. Check for Reasonableness 75. 6 ≈ 80

Find 7 × 22. 5. A. 0. 1575 B. 1. 575 C. 15. 75 D. 157. 5

Annex Zeros in the Product Find 3 × 0. 016. 1 0. 016 × 3 0. 048 three decimal places Annex a zero to the left of 48 to make three decimal places. Answer: The product is 0. 048. Check by Adding 0. 016 + 0. 016 = 0. 048

Find 0. 015 × 5. A. 0. 075 B. 0. 75 C. 0. 750 D. 7. 500

MUFFINS A berry muffin recipe calls for 0. 75 cup of blueberries. Paul is making 5 batches. He already has 2. 5 cups of blueberries. How many more cups does he need? Step 1 2 0. 75 × 5 3. 75 Multiply. two decimal places

Step 2 Subtract. 3. 75 – 2. 50 Line up the decimal points. 1. 25 Answer: Paul will need 1. 25 more cups of blueberries.

MONEY Sabrina has saved $24 for a DVD set. She is saving $5. 25 a week for 5 weeks for the remaining amount. What is the total cost of the DVD set? A. $26. 25 B. $34. 25 C. $50. 25 D. $51. 25