Factors and Prime Numbers and GCF

Front

What are factors?

Back

Factors are numbers that can be multiplied together to get another number. For example, the factors of 15 are 1, 3, 5, and 15.

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. For example, 2, 3, 5, and 7 are prime numbers.

Front

What is the GCF (Greatest Common Factor)?

Back

The GCF of two or more numbers is the largest number that divides all of them without leaving a remainder. For example, the GCF of 20 and 32 is 4.

Front

How do you find the factors of a number?

Back

To find the factors of a number, list all the integers that can be multiplied together to produce that number. For example, the factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24.

Front

Which numbers are factors of 15?

Back

The factors of 15 are 1, 3, 5, and 15.

Front

Which numbers are factors of 24?

Back

The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24.

Front

What is the divisibility rule for 3?

Back

A number is divisible by 3 if the sum of its digits is divisible by 3. For example, 111 is divisible by 3 because 1 + 1 + 1 = 3.

Front

What is the GCF of 24 and 56?

Back

The GCF of 24 and 56 is 8.

Front

How can you determine if a number is prime?

Back

To determine if a number is prime, check if it has any divisors other than 1 and itself. If it does, it is not prime.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.