Mastering Multiplication of Decimals and Whole Numbers

The video tutorial explains how to multiply decimals by whole numbers using estimation and detailed calculations. It covers four examples, demonstrating the process of ignoring the decimal point until the end and adjusting the decimal placement in the final answer. The tutorial emphasizes estimation techniques and provides step-by-step calculations for each example.

Why is it important to estimate the answer before multiplying decimals by whole numbers?

• To make the calculation easier

• To save time

• To check the reasonableness of the final answer

• To avoid using a calculator

Tags

CCSS.5.NBT.B.7

What is the estimated product of $127 and 6?

• $80

• $60

• $70

• $72

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CCSS.4.NBT.B.5

When multiplying decimals, when should you pay attention to the decimal point?

• At the beginning

• In the middle

• At the end

• Never

Tags

CCSS.5.NBT.B.7

What is the actual product of $127 and 6?

• $720

• $724

• $700

• $750

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CCSS.4.NBT.B.5

What is the estimated product of 5.47 and 7?

• $40

• $35

• $30

• $45

Tags

CCSS.5.NBT.B.7

What is the actual product of 5.47 and 7?

• $380

• $370

• $382

• $390

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CCSS.5.NBT.B.7

How many decimal places should you move in the product of 1.061 and 7?

• Four

• Three

• Two

• One

Tags

CCSS.5.NBT.B.7

What is the actual product of 1.061 and 7?

• 7.04

• 7.42

• 7.14

• 7.06

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CCSS.6.NS.B.3

What placeholder can be used in two-digit multiplication?

• None

• Both zero and X

• X

• Zero

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CCSS.4.NBT.B.5

What is the actual product of 12.3 and 24?

• 300.27

• 290.27

• 285.27

• 295.27

Tags

CCSS.6.NS.B.3