1. How do you multiply 0.5 x 0.3?

2. In this lesson you will learn how to multiply decimals by decimals by using an area model.

3. Let’s Review HundredsTens Ones 2 groups of ten = 20 3 single units = 3 1 group of 100 = 100 Ones Hundreds Tens Ones 123

4. Let’s Review Whole Unit (Ones) Tenths Hundredths

5. Let’s Review 2 Tenths 3 Hundredths Ones Tenths Hundredths 123 1.23 1 Whole

6. Let’s Review A Common Mistake Forgetting to take the decimal into consideration when multiplying. 0.3 x 0.5 ≠ 15

7. Let’s Review Core Lesson Smart Estimate 0.5 x 0.3 Smart estimate: A little more than 0.1 ≈ 0.1 0.3 x 0.5 ≈ 0.2 = x 0.5

8. Let’s Review Core Lesson Ones Tenths Hundredths 015 This is a reasonable answer since it is close to my smart estimate 0.5 x 0.3 =

9. Let’s Review Core Lesson Susanna has 0.4 of a box of paper, but she promised to share 0.5 of it with her friend. How much paper will she have? Smart estimate is 0.2 0.4 x 0.5

10. Let’s Review Core Lesson Ones Tenths Hundredths 020 This is a reasonable answer since it matches my smart estimate 0.4 x 0.5 =

11. In this lesson you have learned how to multiply decimals by decimals by using an area model.

12. Let’s Review Guided Practice 0.6 x 0.4

13. Let’s Review Extension Activities 0.5 x 0.7 is 0.35. Explain why the product of these two decimals is smaller thank he two multipliers. Use an area model to help you explain.

14. Let’s Review Extension Activities What is 0.3 x 0.4? How would the answer be different if the problem was 0.3 x 0.04?

15. Let’s Review Quick Quiz Which area model shows 0.4 x 0.7? ABC