Understanding Decimal Multiplication

The video tutorial explains how to multiply decimals by breaking down the process into steps. It covers three examples: 0.4 times 0.7, 0.06 times 0.9, and 0.74 times 0.05. Each example demonstrates how to determine the number of decimal places in the product, multiply as if dealing with whole numbers, and adjust the decimal point accordingly. The tutorial also explains the reasoning behind the placement of decimal points using fractions.

What is the first step in multiplying two decimal numbers?

• Convert them to fractions

• Subtract the smaller number from the larger one

• Add the numbers together

• Write the numbers vertically

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CCSS.5.NBT.B.7

How many decimal places should the product of 0.4 and 0.7 have?

• One

• Two

• Three

• Four

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CCSS.5.NBT.B.7

Why does the product of 0.4 and 0.7 have two decimal places?

• Because 0.4 and 0.7 are both units

• Because 0.4 and 0.7 are both thousandths

• Because 0.4 and 0.7 are both hundredths

• Because 0.4 and 0.7 are both tenths

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CCSS.5.NBT.B.7

How many decimal places should the product of 0.06 and 0.9 have?

• Three

• One

• Four

• Two

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CCSS.6.NS.B.3

What is the product of 0.06 and 0.9?

• 0.54

• 0.540

• 0.054

• 0.0054

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CCSS.5.NBT.B.7

Why does the product of 0.06 and 0.9 have three decimal places?

• Because 0.06 is six hundredths and 0.9 is nine tenths

• Because 0.06 is six hundredths and 0.9 is nine hundredths

• Because 0.06 is six thousandths and 0.9 is nine tenths

• Because 0.06 is six tenths and 0.9 is nine tenths

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CCSS.6.NS.B.3

How many decimal places should the product of 0.74 and 0.05 have?

• One

• Two

• Three

• Four

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CCSS.6.NS.B.3

What is the product of 0.74 and 0.05?

• 0.0370

• 0.0037

• 0.370

• 0.037

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CCSS.5.NBT.A.2

Why can we drop the zero at the end of 0.0370?

• Because it changes the value

• Because it is unnecessary

• Because it is a placeholder

• Because it is incorrect

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CCSS.4.NF.C.6

What is the fraction form of 0.74?

• 74/1

• 74/1000

• 74/100

• 74/10

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CCSS.4.NF.C.6