Percentage Calculations Using Bar Models

This video tutorial covers the concept of percentages using the bar model. It explains how to find percentages of various numbers, increase and decrease numbers by percentages, and solve reverse percentage problems to find original numbers. The tutorial uses visual aids to enhance understanding and provides multiple examples for practice.

What is the purpose of using a bar model in percentage calculations?

• To avoid using numbers

• To make calculations more complex

• To confuse the learner

• To visualize the division of percentages

How do you find 20% of 80 using the bar model?

• Divide 80 by 20

• Add 20 to 80

• Multiply 80 by 0.2

• Divide 80 into 10 parts and take 2 parts

What is the result of calculating 30% of 60 using the bar model?

• 30

• 24

• 18

• 12

How many parts do you need to consider for finding 70% of 40?

• 7 parts

• 6 parts

• 5 parts

• 4 parts

What is the value of 40% of 120 using the bar model?

• 60

• 72

• 48

• 36

How do you calculate 30% of 9 using the bar model?

• Divide 9 into 10 parts and take 3 parts

• Add 3 to 9

• Divide 9 by 3

• Multiply 9 by 0.3

What is the result of finding 20% of 12 using the bar model?

• 2.4

• 3.6

• 1.2

• 4.8

How do you calculate 30% of 22 using the bar model?

• Add 6.6 to 22

• Multiply 22 by 0.3

• Divide 22 by 3

• Divide 22 into 10 parts and take 3 parts

What is the first step in solving increase percentage problems?

• Draw the bar model

• Add the percentage to the total

• Subtract the percentage from the total

• Divide the total by the percentage

How do you increase 80 by 30% using the bar model?

• Multiply 80 by 1.3

• Add 24 to 80

• Subtract 24 from 80

• Divide 80 by 1.3