Prime and Composite

WALT: Recognise prime numbers.

Factors are the numbers you multiply to get another number. Prime numbers are the numbers that have only two factors. What are the factors of 3? 1 and 3 Because 3 has only two factors, it is a prime number. Composite numbers are the numbers that have more than two factors. What are the factors of 6? 1, 2, 3, and 6 Because 6 has more than two factors, it is a composite number. Complete the table:

Number	Prime or composite	Factors
10	composite	1,2,5,10
5	prime	1,5
12	composite	1,2,6,12
18	composite	1,2,9,18
4	composite	1,2,4
11	prime	1,11
24	composite	1,2,12,24
97	prime	1,97
73	prime	1,73
33	composite	1,3,11,33
21	composite	1,3,7,21