Divisibility Rules

Front

What is a divisibility rule?

Back

A rule that helps determine if one number can be divided by another without leaving a remainder.

Front

Which numbers are divisible by 2?

Back

Any even number, such as 2, 4, 6, 8, etc.

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 it ends in 0 or 5.

Front

What is the divisibility rule for 10?

Back

A number is divisible by 10 if it ends in 0.

Front

What is a prime number?

Back

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

Front

What is a composite number?

Back

A number greater than 1 that has more than two positive divisors.

Front

Are the numbers 0 and 1 prime or composite?

Back

Neither prime nor composite.

Front

What is the smallest prime number?

Back

2.

Front

What is the largest two-digit prime number?

Back

97.