Divisibility Rules

Question 1

What is the divisibility rule for 2?

Answer 1

If the last digit is EVEN, then it is divisible by two.

Question 2

What is the divisibility rule for 5?

Answer 2

If the last digit is 0 or 5, then it is divisible by 5.

Question 3

What is the divisibility rule for 10?

Answer 3

If the last digit is 0, it is divisible by 10.

Question 4

What is the divisibility rule for 4?

Answer 4

If the last two digits are divisible by 4, then the whole number is divisible by 4.
(ex.) 17346 - 46 is not divisible by 4

Question 5

What is the divisibility rule for 3?

Answer 5

If the sum of all the digits in a number is divisible by 3, then the original number is also divisible by 3.
(ex.) 17346 - 1 + 7 + 3 + 4 + 6 = 21
-17346 is divisible by 3

Question 6

What is the divisibility rule for 6?

Answer 6

Since 6 = 3 × 2, then circle the rules for 3 and 2.
(ex.) 17346 is divisible by 3,
and 17346 is divisible by 2.
Therefore, 17346 is divisible by 6.