Calculating Percentages with Mental Math Techniques

This video tutorial explains the concept of percentages, starting with basic definitions and moving through various calculations such as 1%, 2%, 10%, 20%, 25%, 50%, 33 1/3%, and 66 2/3%. It provides examples and methods for calculating these percentages, including moving decimal places and using fractions. The tutorial also offers tips for mental math and solving complex percentage problems.

What does the term 'percent' mean?

• Per hundred

• Per fifty

• Per ten

• Per thousand

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CCSS.6.RP.A.3C

How do you calculate 1% of a number?

• Multiply by 100

• Divide by 10

• Move the decimal two places to the left

• Move the decimal one place to the right

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CCSS.6.RP.A.3C

If 10% of 120 is 12, what is 20% of 120?

• 24

• 12

• 36

• 48

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CCSS.6.RP.A.3C

What is 33 1/3% of 120?

• 60

• 50

• 40

• 30

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CCSS.6.RP.A.3C

How do you calculate 25% of a number?

• Divide by 5

• Divide by 4

• Divide by 3

• Divide by 2

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CCSS.6.RP.A.3C

What is 50% of 120?

• 60

• 50

• 30

• 40

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CCSS.6.RP.A.3C

What is 10% of 450?

• 4.5

• 45

• 450

• 0.45

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CCSS.6.RP.A.3C

How do you calculate 3% of 600?

• Find 2% and add 1%

• Find 5% and subtract 2%

• Find 10% and divide by 3

• Find 1% and multiply by 3

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CCSS.6.RP.A.3C

What is 60% of 80?

• 48

• 24

• 36

• 72

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CCSS.6.RP.A.3C

What is 250% of 38?

• 95

• 57

• 76

• 114

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CCSS.6.RP.A.3C