Divisibility Rules for 9

This video tutorial from Moomoomath and Science explains how to determine if a number is divisible by 9. The process involves adding the digits of the number and checking if the sum is divisible by 9. The video provides three examples: 468, 675, and 7038, demonstrating the method step-by-step. Each example confirms the divisibility by showing the sum of the digits and the corresponding multiplication. The video concludes with a call to subscribe for daily math and science content.

What is the first step to determine if a number is divisible by 9?

• Multiply the number by 9

• Subtract 9 from the number

• Add all the digits of the number

• Divide the number by 9

If the sum of the digits of a number is 18, is the number divisible by 9?

• Yes, because 18 is divisible by 9

• No, because 18 is not divisible by 9

• Yes, because 18 is a multiple of 3

• No, because 18 is a prime number

What is the sum of the digits of 468?

• 20

• 16

• 18

• 22

How do you verify if 675 is divisible by 9?

• Subtract 9 from 675

• Add the digits and check if the sum is divisible by 9

• Add the digits and check if the sum is 9

• Check if 675 is a multiple of 3

What is the result of dividing the sum of the digits of 7038 by 9?

• 4

• 2

• 1

• 3