Factors and Multiples...

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What are factors?

Back

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

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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.

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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. For example, 2, 3, 5, and 7 are prime numbers.

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What is the only even prime number?

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The only even prime number is 2.

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What is a composite number?

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A composite number is a number that has more than two factors. For example, 4, 6, and 8 are composite numbers.

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What is a factor pair?

Back

A factor pair consists of two numbers that, when multiplied together, equal a given number. For example, (8, 8) is a factor pair of 64.

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How do you find the greatest common factor (GCF) of two numbers?

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To find the GCF, list the factors of each number and identify the largest factor they have in common.

Front

What is the GCF of 12 and 18?

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The GCF of 12 and 18 is 6.

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What is the least common multiple (LCM)?

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The LCM is the smallest multiple that two or more numbers share. For example, the LCM of 4 and 5 is 20.

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How do you find the LCM of two numbers?

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To find the LCM, list the multiples of each number and identify the smallest multiple they have in common.