Mastering Rules of Divisibility

This video tutorial covers the rules of divisibility for numbers 2, 3, 4, 5, 6, 9, and 10. The teacher explains how to determine if a number is divisible by these numbers using specific rules. Examples are provided using the numbers 132 and 50 to demonstrate the application of these rules. The video concludes with tips on listing factors in order and using a divisibility chart.

What should you write at the top of your packet?

• The date

• Your name

• The subject

• The teacher's name

A number is divisible by 2 if it ends in which of the following digits?

• 2, 4, 6, 8, 10

• 1, 3, 5, 7, 9

• 0, 2, 4, 6, 8

• 0, 1, 2, 3, 4

How do you determine if a number is divisible by 3?

• If it ends in 0 or 5

• If the sum of its digits is divisible by 3

• If it is an even number

• If the last digit is 3

A number is divisible by 4 if:

• It ends in 0 or 5

• The sum of its digits is divisible by 4

• The last two digits form a number divisible by 4

• The last digit is 4

Which of the following is true for a number to be divisible by 5?

• It is an even number

• The sum of its digits is divisible by 5

• It ends in 0 or 5

• The last two digits form a number divisible by 5

A number is divisible by 6 if it is divisible by which two numbers?

• 3 and 5

• 4 and 5

• 2 and 3

• 2 and 4

To check if a number is divisible by 9, you should:

• Check if the last two digits form a number divisible by 9

• Check if it is an even number

• Check if the sum of its digits is divisible by 9

• Check if it ends in 9

For a number to be divisible by 10, its last digit must be:

• 2

• 8

• 0

• 5

Is the number 132 divisible by 3?

• No, because the sum of its digits is not divisible by 3

• Yes, because it ends in 2

• No, because it is not an even number

• Yes, because the sum of its digits is divisible by 3

Is the number 150 divisible by 5?

• No, because it is not an even number

• Yes, because the sum of its digits is divisible by 5

• Yes, because it ends in 0

• No, because it ends in 2