Divisibility Rules

Front

What is the divisibility rule of 2?

Back

The last digit is even.

Front

What is the divisibility rule for 3?

Back

A number is divisible by 3 if the sum of its digits is divisible by 3.

Front

What is the divisibility rule for 5?

Back

A number is divisible by 5 if its last digit is 0 or 5.

Front

What is the divisibility rule for 10?

Back

A number is divisible by 10 if its last digit is 0.

Front

What is the divisibility rule for 4?

Back

A number is divisible by 4 if the last two digits form a number that is divisible by 4.

Front

What is the divisibility rule for 6?

Back

A number is divisible by 6 if it is divisible by both 2 and 3.

Front

What is the divisibility rule for 9?

Back

A number is divisible by 9 if the sum of its digits is divisible by 9.

Front

What does it mean if a number is prime?

Back

A prime number is a number greater than 1 that has no positive divisors other than 1 and itself.

Front

Is the number 27 divisible by 3?

Back

Yes, because the sum of its digits (2 + 7 = 9) is divisible by 3.

Front

Is the number 50 divisible by 5?

Back

Yes, because its last digit is 0.