Calculating Percentages and Fractions

This video tutorial covers benchmark percentages, focusing on 10%, 50%, and 75%. It explains how to calculate these percentages for various quantities and provides mental math techniques for quick calculations. The tutorial includes examples and practice problems to reinforce learning.

What percentage is represented by 1 out of 10 shaded boxes?

• 5%

• 10%

• 15%

• 20%

If you have 10 liters of milk, what is 50% of it?

• 2 liters

• 7 liters

• 5 liters

• 3 liters

How do you calculate 10% of a number?

• Multiply by 2

• Divide by 10

• Multiply by 0.1

• Move the decimal one place to the left

What is 75% of a 24-hour day?

• 18 hours

• 20 hours

• 15 hours

• 12 hours

How can you find 75% of a number using fractions?

• 3/4 of the number

• 2/3 of the number

• 1/2 of the number

• 1/4 of the number

If 9 is 50% of a number, what is the full number?

• 18

• 20

• 22

• 24

What is the reciprocal of 1/4 when calculating percentages?

• 1/4

• 4

• 2

• 1/2

If 9 is 10% of a number, what is the full number?

• 100

• 90

• 45

• 110

What is 20% of 60?

• 18

• 15

• 12

• 10

Diego has 75% of $10, and Noah has 25% of $30. Who has more money?

• Noah

• Cannot be determined

• Diego

• They have the same amount