Common Factors and Multiples

In this video, Mr. J explains the concepts of factors and multiples, including common factors, greatest common factor (GCF), common multiples, and least common multiple (LCM). The video provides examples using numbers 12, 18, 6, and 15 to illustrate how to find factors and multiples, as well as their commonalities. The tutorial emphasizes understanding through examples and encourages practice to improve proficiency in identifying factors and multiples.

Which of the following is a factor of 18?

• 5

• 7

• 9

• 11

What is the first step in finding the factors of a number?

• Start with one and the number itself

• Start with any random number

• Start with zero

• Start with the largest number

What is the greatest common factor (GCF) of 12 and 18?

• 9

• 6

• 3

• 2

Which of the following is a common factor of 12 and 18?

• 4

• 5

• 8

• 6

What is a multiple of a number?

• A number that divides evenly into another

• A number obtained by adding two numbers

• A number obtained by multiplying the given number by an integer

• A number that is always greater than 100

Which of the following is a multiple of 6?

• 11

• 18

• 25

• 33

What is the simplest way to think about multiples?

• As division

• As skip counting

• As subtraction

• As addition

What is the least common multiple (LCM) of 6 and 15?

• 60

• 15

• 30

• 45

What is the next common multiple of 6 and 15 after 30?

• 45

• 50

• 75

• 60

How many common multiples do two numbers have?

• One

• Two

• Infinite

• None