If you buy 3 sandwiches for 4.95 or 4 sandwiches for 6.72 which is the better buy

Prime numbers are whole numbers that has factors of 1 and itself.

Example: 2 is a prime because there is no way you could factor it except 1 and 2.

Composite numbers have more factors which also include 1 and itself.

Example: 50 is composite because it has factors more than 1 and itself.

5 is a factor of 50; 10 is a factor of 50.

So let's begin sorting.

Prime: 7, 11, 31.

Composite: 4, 8, 10, 27.

Hope this helps! :)