Exploring GCF and LCM Concepts

The video tutorial covers the concepts of greatest common factor (GCF) and least common multiple (LCM). It begins with an introduction and setup instructions for organizing materials. The teacher explains the GCF as the largest number that divides two numbers without a remainder, using the ladder method with examples. The LCM is described as the smallest number that both numbers divide into, also demonstrated with the ladder method. The tutorial emphasizes the importance of organization and checking work.

What should you do if the edges of your glued paper start to come up?

• Re-glue it

• Ignore it

• Ask the teacher to fix it

• Tear it off

Tags

CCSS.RI.6.5

CCSS.RI.7.5

CCSS.RI.8.3

CCSS.RI.8.5

CCSS.RI.9-10.5

What is the greatest common factor (GCF)?

• The smallest number that is a factor of two numbers

• The largest number that is a multiple of two numbers

• The smallest number that is a multiple of two numbers

• The largest number that is a factor of two numbers

Which of the following is a factor of both 24 and 36?

• 5

• 7

• 8

• 6

What is the first step in finding the GCF using the ladder method?

• Multiply the two numbers

• Subtract the smaller number from the larger number

• Add the two numbers

• Divide the two numbers by the smallest common factor

What is the GCF of 24 and 36?

• 6

• 8

• 10

• 12

What is the least common multiple (LCM)?

• The largest number that both numbers divide into

• The smallest number that both numbers divide into

• The largest number that is a factor of both numbers

• The smallest number that is a factor of both numbers

Which of the following is a multiple of 5?

• 10

• 3

• 7

• 12

Tags

CCSS.4.OA.B.4

What is the first step in finding the LCM using the ladder method?

• Add the two numbers

• Multiply the two numbers

• Subtract the smaller number from the larger number

• Divide the two numbers by the smallest common factor

What is the LCM of 16 and 36?

• 180

• 72

• 108

• 144

Which of the following numbers is divisible by both 16 and 36?

• 72

• 48

• 144

• 96