Understanding Ratios and Proportions

This video covers practice problems from unit 4 lesson 5, focusing on decimals and fractions. It includes solving problems related to peanut butter consumption, water usage by a football team, library books checked out, expressions greater than a number, and heart rate calculations. The video emphasizes understanding and applying mathematical concepts like subtraction, multiplication, and comparison.

If a family starts with 80 ounces of peanut butter and consumes 0.3 of it, how many ounces are left?

• 72 ounces

• 56 ounces

• 24 ounces

• 60 ounces

What is the complement of 0.3 when considering a whole?

• 0.5

• 0.3

• 0.7

• 1.0

A football team drinks a 50-gallon cooler of water and then half as much again. How much water did they drink in total?

• 75 gallons

• 25 gallons

• 100 gallons

• 50 gallons

If a cooler holds 50 gallons, and the team drinks 1.5 times that amount, how much is left?

• 50 gallons

• 25 gallons

• 0 gallons

• 75 gallons

Jada has 12 library books. Han has 1/3 less than Jada. How many books does Han have?

• 4 books

• 10 books

• 8 books

• 6 books

Han has 2/3 of the books Jada has. If Jada has 12 books, how many does Han have?

• 6 books

• 10 books

• 9 books

• 8 books

Which expression is greater than a positive number X?

• 9/8 * X

• 7/8 * X

• X + 1/4

• X - 1/4

Which of the following is not greater than X?

• X - 1/4

• 7/8 * X

• 9/8 * X

• X + 1/4

Noah counts 8 heartbeats in 10 seconds. What is his heart rate in beats per minute?

• 48 bpm

• 60 bpm

• 80 bpm

• 72 bpm

How do you calculate the number of heartbeats in a minute if you know the beats in 10 seconds?

• Multiply by 6

• Multiply by 10

• Multiply by 5

• Multiply by 4