Percentage and Proportion Problems

This lesson focuses on finding 100% given another percentage using factors of 100. It includes examples such as calculating the total number of students in a band, tire sales, fantasy baseball points, and road trip miles. The lesson emphasizes using mental math and proportions to solve percentage problems effectively.

What is the largest factor of 100?

• 100

• 10

• 25

• 50

How many multiples of 25 are there in 100?

• 3

• 2

• 4

• 5

If 42 students represent 75% of the band, how many students are in the band?

• 100

• 75

• 42

• 56

A salesman sold 165 tires, which was 60% of the total sales. How many tires were sold in total?

• 275

• 330

• 165

• 220

Nick has 7,200 points, which is 20% more than Adam. How many points does Adam have?

• 8,640

• 7,200

• 5,760

• 6,000

Kurt has driven 276 miles, which is 30% of his trip. How many miles is the entire trip?

• 920

• 644

• 276

• 828

If 39 is 1% of a number, what is the number?

• 390

• 39

• 3,000

• 3,900

If 39 is 10% of a number, what is the number?

• 39

• 3900

• 390

• 3,900

If 39 is 5% of a number, what is the number?

• 3,900

• 1,950

• 390

• 780

How many times do you multiply 5% to get 100%?

• 15

• 20

• 10

• 25