Easy step by step directions for finding all of the prime numbers between 1 and 100.

Prime numbers are only divisible by 1 and itself.

Step 1. The number 1 is a unique case. It is neither prime or composite.

Step 2. Write out all numbers between 1 and 100.

Step 3. Circle 2,3,5 and 7 and then mark out multiples of 2,3,5, and 7.

Step 4. All numbers circles or not marked out is considered prime.

MooMooMath and Science