Divisibility Rules for 3

The video tutorial explains how to determine if a number is divisible by 3 using a simple method. By adding the digits of the number and checking if the sum is divisible by 3, one can conclude the divisibility of the entire number. The example of 1,692 is used, where the sum of its digits is 18, which is divisible by 3, confirming that 1,692 is also divisible by 3. The video concludes with a verification of the method.

What is the initial question posed in the video?

• Is 1,692 an even number?

• Is 1,692 divisible by 3?

• Is 1,692 a prime number?

• Is 1,692 divisible by 2?

What is the first step in determining if a number is divisible by 3?

• Add the digits together

• Multiply the digits together

• Subtract the digits from each other

• Divide the number by 2

What is the sum of the digits of 1,692?

• 15

• 20

• 21

• 18

Why is 1,692 divisible by 3?

• Because it is a prime number

• Because it is an even number

• Because it ends in a 2

• Because the sum of its digits is divisible by 3

What multiplication is used to verify the divisibility of 1,692 by 3?

• 564 * 4

• 564 * 3

• 564 * 5

• 564 * 2