GCF and LCM Word Problems Challenge

The video tutorial explains how to determine whether to use the Greatest Common Factor (GCF) or the Least Common Multiple (LCM) in word problems. It provides examples of each: a GCF problem involving Skittles and Hershey bars, and an LCM problem involving train schedules. The tutorial guides viewers through the process of solving these problems, emphasizing the importance of identifying when to use GCF or LCM and demonstrating the calculations step-by-step.

What is the hardest part of solving GCF and LCM word problems?

• Understanding the problem

• Choosing between GCF and LCM

• Writing the final answer

• Performing the calculations

Sheila has 28 skittle bags and 36 Hershey bars. What is the greatest number of goodie bags she can make?

• 4

• 2

• 8

• 6

How many skittles will be in each goodie bag if Sheila makes the greatest number of bags?

• 5

• 8

• 6

• 7

Tags

CCSS.3.OA.A.3

How many Hershey bars will be in each goodie bag if Sheila makes the greatest number of bags?

• 8

• 7

• 10

• 9

Tags

CCSS.3.OA.A.3

When should you use the GCF in a word problem?

• When you need to find the smallest number that is a multiple of two numbers

• When you need to add two numbers

• When you need to subtract two numbers

• When you need to find the largest number that divides two numbers

Train A makes stops every 45 minutes and Train B every 60 minutes. How many minutes will pass before they both stop at the same time?

• 150

• 120

• 90

• 180

How many loops will Train A make in 180 minutes?

• 2

• 3

• 4

• 5

Tags

CCSS.6.RP.A.3B

How many loops will Train B make in 180 minutes?

• 2

• 3

• 4

• 5

Tags

CCSS.6.RP.A.3B

When should you use the LCM in a word problem?

• When you need to subtract two numbers

• When you need to find the largest number that divides two numbers

• When you need to find the smallest number that is a multiple of two numbers

• When you need to add two numbers

What is the LCM of 45 and 60?

• 210

• 180

• 150

• 120