1. #04 In-Class Activity Sieve of Erasthones Prime and Composite #’s

2. 12345678910 11121314151617181920 21222324252627282930 31323334353637383940 41424344454647484950 51525354555657585960 61626364656667686970 71727374757677787980 81828384858687888990 919293949596979899100 x

3. Colored #’s are: A Composite # is: A # that has other #’s that go into it besides 1 & itself. Circled #’s are: A Prime # is: A # that can only be divided evenly by itself or 1 1 is neither prime nor composite because: it only has one factor - itself. Therefore it can't be prime or composite (not enough factors). 0 is neither prime nor composite because: every number is a factor of 0 giving it too many factors to count. Every number can divide into 0 0 can’t be divided by itself! Try 0 ÷ 0 on your calculator.