Finding Whole Numbers and Percentages

This video tutorial reviews finding a percent of a number and introduces finding the whole given the percent and part. It includes step-by-step examples and practice problems, emphasizing the importance of rewriting problems and using mental math strategies. The tutorial also highlights the use of variables and equations to solve these types of problems.

What is the first step in finding 15% of 90?

• Convert 15% to a decimal

• Divide 90 by 15

• Subtract 15 from 90

• Multiply 90 by 15

If 30% of a number equals 18, what is the number?

• 60

• 54

• 45

• 30

To isolate the variable in the equation 0.30x = 18, what operation should you use?

• Addition

• Division

• Subtraction

• Multiplication

What is the whole number if 24% of it equals 21.6?

• 60

• 70

• 80

• 90

Why is it important to rewrite the problem and show your steps?

• To avoid using a calculator

• To confuse others

• To ensure the order of operations is correct

• To make the problem look longer

What is 76% of 114?

• 86.64

• 80.64

• 90.64

• 84.64

If 50% of a number is 32, what is the number?

• 60

• 50

• 64

• 40

What does 50% mean in terms of fractions?

• One-fifth

• One-third

• One-fourth

• One-half

What is 20% of 55?

• 11

• 13

• 10

• 12

How can you use mental math to find 20% of 55?

• Divide 55 by 4

• Multiply 55 by 0.2

• Divide 55 by 5

• Multiply 55 by 2