Mastering Percentages with Mental Math Techniques

This video tutorial teaches how to use mental math to solve percentage problems. It covers basic percentages like 1%, 2%, 5%, 10%, 20%, 25%, 50%, and 100%, and explains how to calculate these using simple mental strategies. The tutorial provides examples, such as finding 12% of 60 and 24% of 48, and demonstrates advanced calculations like 51% of 72 and 98% of 24. The video concludes with a review of the strategies discussed.

Why is it important to memorize certain key percentages?

• They are used in geometry.

• They are required for advanced calculus.

• They make it easier to calculate percentages mentally.

• They help in solving all types of math problems.

What does 1% of a number represent?

• 1/20 of the number

• 1/50 of the number

• 1/100 of the number

• 1/10 of the number

Tags

CCSS.6.RP.A.3C

How can you calculate 2% of a number?

• Move the decimal point one place to the left

• Double the value of 1% of the number

• Subtract 1% from the number

• Divide the number by 50

Tags

CCSS.6.RP.A.3C

What is the easiest way to find 10% of a number?

• Add 1% ten times

• Move the decimal point two places to the left

• Divide the number by 10

• Multiply the number by 10

Tags

CCSS.6.RP.A.3C

How can you calculate 25% of a number?

• Subtract 5% from 30%

• Add 10% and 15%

• Multiply the number by 4

• Divide the number by 4

Tags

CCSS.6.RP.A.3C

What is 12% of 60?

• 9.2

• 8.2

• 7.2

• 6.2

Tags

CCSS.6.RP.A.3C

How do you calculate 24% of 48?

• Find 20% and add 4%

• Find 25% and subtract 1%

• Find 50% and divide by 2

• Find 10% and multiply by 2.4

Tags

CCSS.6.RP.A.3C

What is 51% of 72?

• 37.72

• 36.72

• 35.72

• 38.72

Tags

CCSS.6.RP.A.3C

How can you find 98% of 24?

• Find 100% and subtract 2%

• Find 10% and multiply by 9.8

• Find 50% and double it

• Find 25% and multiply by 4

Tags

CCSS.6.RP.A.3C

What is 70% of 56?

• 40.2

• 41.2

• 39.2

• 38.2

Tags

CCSS.6.RP.A.3C