Review - prime/composite/GCF/LCM

Front

What is the greatest common factor (GCF) of two numbers?

Back

The greatest common factor (GCF) is the largest number that divides both numbers without leaving a remainder.

Front

How do you find the GCF of 36 and 24?

Back

List the factors of each number: Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36; Factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24. The GCF is 12.

Front

What is the least common multiple (LCM) of two numbers?

Back

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

Front

How do you find the LCM of 4 and 10?

Back

List the multiples of each number: Multiples of 4 are 4, 8, 12, 16, 20, 24, ...; Multiples of 10 are 10, 20, 30, ... The LCM is 20.

Front

What is a prime number?

Back

A prime number is a whole number greater than 1 that has exactly two distinct positive divisors: 1 and itself.

Front

Is 1 a prime number?

Back

No, 1 is not a prime number because it has only one positive divisor.

Front

What is a composite number?

Back

A composite number is a whole number greater than 1 that has more than two factors.

Front

Give an example of a composite number.

Back

An example of a composite number is 4, which has factors 1, 2, and 4.

Front

What is the relationship between prime and composite numbers?

Back

Every whole number greater than 1 is either a prime number or a composite number.

Front

What is the significance of the number 0 in terms of prime and composite classification?

Back

0 is neither a prime nor a composite number.