Finding Parts and Totals with Percent Proportions

This video tutorial explains how to use percent proportions to find missing parts or totals. It covers the concept of percent proportions, where one ratio compares part of a quantity to the whole, and the other ratio is the equivalent percent. The tutorial provides step-by-step examples to solve various problems, such as finding a part of a whole, determining a number from a percent, and calculating the original price from a sale price. Each example demonstrates setting up a proportion, cross-multiplying, and solving for the unknown value.

What is a percent proportion?

• A method to find the average of two numbers

• A proportion where one ratio compares part of a quantity to the whole quantity and the other ratio is the equivalent percent

• A way to convert fractions to decimals

• A ratio comparing two different quantities

If you need to find 12.5% of 88, what is the first step?

• Divide 88 by 12.5

• Add 12.5 to 88

• Multiply 88 by 12.5

• Subtract 12.5 from 88

What is 35% of 48?

• 16.8

• 14.5

• 18.2

• 20.4

75% is 20 of what number?

• 30

• 25

• 20

• 375

19 is 62.5% of what number?

• 30.4

• 25.6

• 32.5

• 28.8

A basketball team won 55% of their 60 games. How many games did they win?

• 33

• 35

• 30

• 27

Eric answered 70% of the questions correctly on his exam and got 14 correct answers. How many total questions were on the exam?

• 24

• 22

• 20

• 18

A book bag is on sale for $7.50, which is 60% of the original price. What was the original price?

• $10.00

• $20.00

• $12.50

• $15.00

Out of 240 students, 25% chose hamburgers. How many students chose hamburgers?

• 70

• 60

• 80

• 50

What is the simplified form of the ratio 70 out of 100?

• 21 out of 30

• 7 out of 10

• 14 out of 20

• 35 out of 50