Factors and Multiples

Front

What are factors?

Back

Factors are numbers that can be multiplied together to get another number. For example, the factors of 20 are 1, 2, 4, 5, 10, and 20.

Front

List the factors of 20.

Back

The factors of 20 are 1, 2, 4, 5, 10, and 20.

Front

List the factors of 30.

Back

The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.

Front

What is a prime number?

Back

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

Front

Which number is prime: 15, 21, 5, 12?

Back

5 is a prime number.

Front

Which number is prime: 12, 15, 4, 3?

Back

3 is a prime number.

Front

What is a composite number?

Back

A composite number is a number that has more than two positive divisors. For example, 12 is composite because it can be divided by 1, 2, 3, 4, 6, and 12.

Front

Which number is composite: 3, 5, 11, 12?

Back

12 is a composite number.

Front

What are multiples?

Back

Multiples are the result of multiplying a number by an integer. For example, the multiples of 3 are 3, 6, 9, 12, 15, etc.

Front

What is the least common multiple (LCM)?

Back

The least common multiple (LCM) of two numbers is the smallest number that is a multiple of both numbers.