Finding Percent of a Number

The video tutorial explains how to use bar models to understand and calculate percentages. It provides examples of finding percentages of numbers, such as 80% of 80, 30% of 50, and 25% of 60. The tutorial also applies these concepts to real-world scenarios, like determining the number of students riding a bus and calculating savings from a paycheck. The video concludes with a practice exercise for students to apply their learning.

What is the purpose of using bar models in percentage calculations?

• To simplify complex algebraic equations

• To create graphical art

• To solve geometry problems

• To visualize and calculate percentages easily

What is the first step in using a bar model to find a percentage of a number?

• Divide the number by 100

• Identify the total as 100%

• Color in the bar model

• Calculate the percentage directly

What is 80% of 80?

• 60

• 64

• 65

• 70

What does each block represent in a bar model divided into 10 parts for calculating percentages?

• 5%

• 10%

• 20%

• 15%

In the context of the video, what does 10% of 80 equal when using a bar model?

• 10

• 8

• 15

• 12

How do you calculate 30% of 50 using a bar model?

• Divide 50 by 10 and count by fives up to 30%

• Multiply 50 by 0.3

• Add 30% incrementally to 50

• Subtract 30% from 50

What is 25% of 60?

• 12

• 15

• 20

• 18

How many students ride the bus if 45% of 30 students do?

• 14

• 12

• 13

• 13.5

What is the correct way to handle a calculation result of 13.5 students in the context of the video?

• Either round up to 14 or down to 13

• Report exactly 13.5

• Round down to 13

• Round up to 14

If Polina saves 15% of her $500 paycheck, how much does she save?

• $100

• $125

• $50

• $75