Common Factors and Multiples

The video tutorial by Mr. J covers the concepts of factors and multiples, including common factors, greatest common factor (GCF), common multiples, and least common multiple (LCM). It begins with an introduction to factors, explaining how to determine the factors of a number and identify common factors. The tutorial then moves on to multiples, illustrating how to find multiples of a number and identify common multiples. The video provides examples using numbers 12, 18, 6, and 15 to demonstrate these concepts, emphasizing the importance of understanding these foundational math topics.

Which of the following is NOT a factor of 12?

• 1

• 4

• 5

• 6

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

• Start with 1 and the number itself

• List all even numbers

• Divide by 2

• Multiply by 3

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

• 3

• 6

• 2

• 9

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

• 6

• 5

• 7

• 8

What is a multiple of a number?

• A number that divides evenly into another

• A number obtained by multiplying by an integer

• A number that is a fraction

• A number obtained by adding two numbers

Which of the following is a multiple of 6?

• 11

• 18

• 31

• 25

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

• 15

• 30

• 45

• 60

Which of the following is NOT a common multiple of 6 and 15?

• 30

• 75

• 45

• 60

How can you find the least common multiple (LCM) of two numbers?

• By subtracting the smaller number from the larger

• By dividing the larger number by the smaller

• By finding the smallest number that is a multiple of both

• By adding the two numbers

What is the next step after listing the first few multiples of a number?

• Multiply by 3

• Divide by 2

• Find common multiples

• Stop listing