Factors and Multiples

Front

What is a factor?

Back

A factor is a whole number that can be divided evenly into another number. For example, factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.

Front

What is a multiple?

Back

A multiple is the result of multiplying a number by an integer. For example, multiples of 5 include 5, 10, 15, 20, 25, etc.

Front

What is a composite number?

Back

A composite number is a whole number greater than 1 that has more than two factors. For example, 20 is composite because it has factors 1, 2, 4, 5, 10, and 20.

Front

What is a prime number?

Back

A prime number is a whole number greater than 1 that has exactly two factors: 1 and itself. For example, 7 is prime because its only factors are 1 and 7.

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

How do you find factors of a number?

Back

To find factors of a number, divide the number by whole numbers starting from 1 up to that number. If the division results in a whole number, both the divisor and the quotient are factors.

Front

What is the least common multiple (LCM)?

Back

The least common multiple (LCM) of two or more numbers is the smallest number that is a multiple of each of the numbers. For example, the LCM of 4 and 5 is 20.

Front

What is the greatest common factor (GCF)?

Back

The greatest common factor (GCF) of two or more numbers is the largest number that divides each of the numbers without leaving a remainder. For example, the GCF of 12 and 16 is 4.

Front

Which of the following is a multiple of 3: 9, 10, 11?

Back

9 is a multiple of 3 because 3 x 3 = 9.

Front

Which of the following is NOT a factor of 12: 2, 3, 5?

Back

5 is NOT a factor of 12.