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How do you multiply 7 x 0.15? In this lesson you will learn how to multiply decimals by whole numbers by using an area model. Let’sReview Review Let’s Ones 1 group of 100 = 100 2 groups of ten = 20 Ones 3 single units = 3 Ones Tens Tens Hundreds Hundreds 1 2 3 Let’sReview Review Let’s Whole Unit (Ones) Hundredths Tenths 1 Whole 2Tenths 3 Hundredths Tenths Hundredths 1.23 Ones Let’sReview Review Let’s 1 2 3 Let’sReview Review Let’s Multiplication is repeated addition 5 x3 15 3 + 3 + 3 + 3 + 3 = 15 A Common Let’s Review Mistake Forgetting to take the decimal into consideration when multiplying. 0.1 x 11 ≠ 11 CoreReview Lesson Let’s 0.15 is halfway 7 x 0.1 is 7 between 0.1 and tenths 0.2 Smart Estimate 7 x 0.15 7 x0.15 = 7 = 7 ≈ x0.1 ≈ x0.2 0.7 1.4 Smart estimate: Between 0.7 and 1.4 Around 1 714x tenths 0.2 is is 14 written tenths1.4 Hundredths This is a reasonable answer since it is close to my smart estimate Tenths 7 x 0.15 Ones CoreReview Lesson Let’s 1 0 5 CoreReview Lesson Let’s A pencil costs $0.28. How much do 6 pencils cost? $0.28 is close to $.25 6 x0.28 = 6 ≈ x0.25 $1.50 Smart estimate: Around $1.50 Hundredths This is a reasonable answer since it is close to my smart estimate Tenths 6 x $0.28 Ones CoreReview Lesson Let’s 1 6 8 In this lesson you have learned how to multiply decimals by whole numbers by using an area model. Guided Practice Let’s Review 5 x 0.25 Extension Let’s ReviewActivities Explain why the answer is a decimal when you multiply a whole number by a decimal. Extension Let’s ReviewActivities Estimate the answer and then use an area model to show the multiplication of 4 x 0.35. Quick Quiz Let’s Review Which area model shows 3 x 0.18? A B C D