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

Tags

CCSS.2.OA.C.3

A number ending in which digit is divisible by 5?

• 1

• 3

• 7

• 5

Tags

CCSS.3.OA.D.9

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

• 2

• All of the above

• 5

• 10

Tags

CCSS.3.OA.D.9

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

Tags

CCSS.3.OA.D.9

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

Tags

CCSS.4.OA.B.4

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

• 5

• 4

• 6

• 9

Tags

CCSS.4.OA.B.4

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

Tags

CCSS.4.OA.B.4

Which of the following numbers is divisible by 4?

• 123

• 124

• 125

• 126

Tags

CCSS.4.OA.B.4

Which of the following numbers is not divisible by 4?

• 2610

• 124

• 724

• None of the above

Tags

CCSS.4.OA.B.4

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

• 4

• 10

• 5

• 2

Tags

CCSS.7.NS.A.2B