Factors, Prime, & Composite Numbers

Front

What is a factor?

Back

A factor is a number that divides another number without leaving a remainder. For example, factors of 36 include 1, 2, 3, 4, 6, 9, 12, 18, and 36.

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. Examples include 2, 3, 5, 7, and 11.

Front

What is a composite number?

Back

A composite number is a natural number greater than 1 that has more than two factors. For example, 4, 6, 8, and 9 are composite numbers.

Front

Which of the following is a factor of 36? 7, 9, 10, 5

Back

9

Front

Which list has only composite numbers? 1, 3, 4; 2, 4, 6; 4, 6, 8; 5, 6, 8

Back

4, 6, 8

Front

Who made an error in listing prime numbers: Eric, Maya, Bella, Joan?

Back

Joan (included 21, which is composite).

Front

What is the smallest prime number?

Back

2 is the smallest prime number.

Front

What is the largest prime number less than 20?

Back

The largest prime number less than 20 is 19.

Front

What is the difference between prime and composite numbers?

Back

Prime numbers have exactly two distinct positive divisors (1 and the number itself), while composite numbers have more than two.

Front

If a number has exactly three factors, what type of number is it?

Back

It is a square of a prime number. For example, 9 (which is 3^2) has factors 1, 3, and 9.