Finding Percentages Quickly and Easily

This video tutorial explains how to calculate the percentage of a number using simple mental math techniques. It starts with basic examples like finding 10% and builds up to more complex calculations such as 23% by breaking them down into smaller, manageable parts. The video emphasizes using 10% as a base and demonstrates how to use multiplication and addition to find other percentages. Each example is checked using multiplication with decimal equivalents to ensure accuracy.

What is 10% of 400?

• 10

• 40

• 400

• 4

Tags

CCSS.6.RP.A.3C

If 10% of 500 is 50, what is 20% of 500?

• 100

• 50

• 200

• 150

Tags

CCSS.6.RP.A.3C

How do you verify 20% of 500 is correct using multiplication?

• 500 * 0.02

• 500 * 0.1

• 500 * 2

• 500 * 0.2

Tags

CCSS.6.RP.A.3C

What is 30% of 150?

• 30

• 15

• 150

• 45

Tags

CCSS.6.RP.A.3C

How do you find 15% of 400?

• Sum of 10% and 5%

• Multiply 400 by 0.15

• Divide 400 by 15

• None of the above

Tags

CCSS.6.RP.A.3C

What is 25% of 700?

• 25

• 70

• 175

• 750

Tags

CCSS.6.RP.A.3C

How can you check the calculation of 25% of 700 using a calculator?

• Add 25 to 700

• Divide 700 by 25

• Multiply 700 by 0.025

• Multiply 700 by 0.25

Tags

CCSS.6.RP.A.3C

What is 23% of 300?

• 69

• 23

• 300

• 230

Tags

CCSS.6.RP.A.3C

How do you find 1% of a number?

• Divide by 100

• Move the decimal one place to the left

• Move the decimal two places to the left

• Multiply by 0.01

Tags

CCSS.6.RP.A.3C

What is the sum of 20% and 3% of 300?

• 69

• 300

• 60

• 23

Tags

CCSS.6.RP.A.3C