Divisibility Rules Review

Which of the following is an even number?

• 1
• 9
• 4
• 5

What is the divisibility rule for 3?

• Add up the digits. The sum must be even and divisible by 3.
• The digits must add up to 9.
• The last digit must be a 3.
• Add up the digits. The sum must be divisible by 3.

What is the divisibility rule for 5?

• The digits must add up to 10.
• The last digit needs to be a 5 or 0.
• The last digit can only be a 5.
• The sum of the digits need to be divisible by 5.

Is 1,284,604 divisible by 2?

• Yes, because the sum of the digits is 20, which is an even number

• No, because 4 is an odd number

• Yes, because 4 is an even number

• No, because the it is not divisible by 3

A number is divisible by 10 if

• It is even

• It ends in 0

• It ends in 0 or 5

• The sum of the digits is a multiple of 10

Is 10 divisible by 3? Hint: 1+0=1

• YES
• N0

Is 11 divisible by 3? Hint: 1+1=2

• YES
• N0

Is 12 divisible by 3? Hint: 1+2=3

• YES
• N0

Is 13 divisible by 3? Hint: 1+3=4

• YES
• N0

Is 15 divisible by 3? Hint: 1+5=6

• YES
• N0