Exploring Divisibility Rules

The video tutorial explains various divisibility rules, which are useful for simplifying fractions and determining if numbers are prime or composite. It covers rules for divisibility by 2, 5, 10, 3, 9, 4, and 6, providing examples and practice problems to illustrate each rule. The tutorial emphasizes the importance of these rules in mathematical problem-solving.

Which of the following numbers is divisible by 2?

• 22

• 37

• 15

• 49

A number ending in which digit is divisible by 5?

• 1

• 3

• 7

• 5

If a number ends in 0, which of the following is it divisible by?

• 2

• All of the above

• 5

• 10

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

• If it ends in 0

• If the sum of its digits is divisible by 3

• If it ends in 3

• If it is an even number

What is the rule for a number to be divisible by 9?

• It ends in 0

• The sum of its digits is divisible by 9

• It is an even number

• It ends in 9

If a number is divisible by both 2 and 3, which other number is it automatically divisible by?

• 5

• 4

• 6

• 9

To check if a number is divisible by 4, you should:

• Check if it ends in 4

• Check if the last two digits are divisible by 4

• Check if it is an even number

• Check if the sum of its digits is divisible by 4

Which of the following numbers is divisible by 4?

• 123

• 124

• 125

• 126

Which of the following numbers is not divisible by 4?

• 2610

• 124

• 724

• None of the above

For the number 7215, which of the following divisibility rules apply?

• 4

• 10

• 5

• 2