Understanding Percentages and Decimals

This video tutorial teaches how to calculate the percentage of a number using two examples. The first example demonstrates finding 5% of 80 by converting the percentage to a decimal and multiplying. The second example shows how to calculate 20% of 120 using a similar method. The tutorial emphasizes the importance of handling decimal points correctly in multiplication and provides a clear, step-by-step guide for each example.

What is the first step in finding the percentage of a number?

• Multiply the number by 100

• Convert the percentage to a fraction

• Divide the number by 100

• Convert the percentage to a decimal

How do you convert 5% to a decimal?

• 0.005

• 5.0

• 0.5

• 0.05

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CCSS.6.NS.B.3

What is the result of multiplying 80 by 0.05?

• 4

• 0.4

• 8

• 40

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CCSS.5.NBT.B.7

When multiplying decimals, what should you do after the multiplication?

• Add the decimals

• Ignore the decimals

• Count the decimal places and adjust the result

• Round the result to the nearest whole number

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CCSS.6.RP.A.3C

What is the value of 5% of 80?

• 40

• 4

• 0.4

• 8

How do you convert 20% to a decimal?

• 0.2

• 2.0

• 0.02

• 20.0

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CCSS.5.NBT.B.7

What is the result of multiplying 120 by 0.20?

• 12

• 240

• 2.4

• 24

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CCSS.5.NBT.B.7

How many decimal places should you count when multiplying 120 by 0.20?

• None

• Two

• Three

• One

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CCSS.6.RP.A.3C

What is the value of 20% of 120?

• 2.4

• 12

• 240

• 24

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CCSS.5.NBT.A.3A

What can you do with zeros to the left of the decimal point?

• Keep them

• Remove them

• Convert them to ones

• Ignore them

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CCSS.5.NBT.A.3A