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2. Prime numbers – numbers made up of only
1 and itself.
› Ex. 13 = 1 X 13 only
Composite numbers – numbers made up of
multiple combinations.
› Ex. 6 = 1X6, 2X3

3. Grab a pile of tiles.
Can you show how 6 = 1x6 and 2x3?
Can you show how 13 only = 1x13?
How about 8?
7?
14?
20?
31?
35?

4. Factor Trees
45 60
9 5 10 6
3 3 5 2 3 2
3 x 3 x 5 5 x 3 x 2 x 2

5. 100 88 296
355 1500 57

6. Determine whether the following numbers
are prime or composite.
15? 21? 600? 37?
32006? 123456789? 3?
555? 67000? 7899?