Factors and Multiples

Front

What is a composite number?

Back

A composite number is a positive integer that has at least one positive divisor other than one or itself. For example, 12 is composite because it can be divided by 1, 2, 3, 4, 6, and 12.

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. For example, 5 is prime because its only divisors are 1 and 5.

Front

What are factors?

Back

Factors are numbers that can be multiplied together to get another number. For example, the factors of 24 include 1, 2, 3, 4, 6, 8, 12, and 24.

Front

What is a factor pair?

Back

A factor pair consists of two numbers that, when multiplied together, equal a given number. For example, (2, 12) is a factor pair of 24.

Front

List the factors of 20.

Back

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

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

Is 15 a prime or composite number?

Back

15 is a composite number because it has factors other than 1 and itself (1, 3, 5, 15).

Front

Which of the following is a prime number: 4, 5, 6?

Back

5 is a prime number.

Front

What is the greatest common factor (GCF) of 12 and 16?

Back

The GCF of 12 and 16 is 4.

Front

What is the least common multiple (LCM) of 3 and 4?

Back

The LCM of 3 and 4 is 12.