1. Factors & Multiples
P4 Math

2. Factors
• Factors are the numbers you multiply
together to get a product.
• For example, the product 24 has several
factors.
• 24 = 1 x 24
• 24 = 2 x 12
• 24 = 3 x 8
• 24 = 4 x 6
• SO, the factors are 1, 2, 3, 4, 6, 8, 12, 24

3. Finding Factors
• Start with 1 x the number.
• Try 2, 3, 4, etc.
• When you repeat your factors, cross out
the repeat - you’re done at this point.
• If you get doubles (such as 4 x 4), then
you’re done. Repeats or doubles let
you know you’re done.

4. What are the factors of 16?
1 x 16
2x8
3 x ?? 3 is not a factor, so cross it out
4x4 doubles = done
The factors of 16 are
1,2,4,8,16

5. What are the factors of 18?
1 x 18 The factors are
2 x 9 1,2,3,6,9,18
3 x 6
4 x ??
5 x ??
6 x 3 Repeat! Cross it out!
We’re done!

6. What are the factors of 7?
1x7 The only factors
2 x ?? of 7 are 1,7
3 x ??
4 x ??
5 x ??
6 x ??
7 x 1 This works, but it is a repeat. We
are done.

7. Multiples
• A multiple is formed by multiplying a
given number by the counting numbers.
• The counting numbers are 1, 2, 3, 4, 5,
6, etc.

8. Example: List the multiples of 4:
• 4x1=4 So, the multiples of 4
are 4, 8, 12, 16, 20, 24,
• 4x2=8 28, etc.
• 4 x 3 = 12
• 4 x 4 = 16
• 4 x 5 = 20
• 4 x 6 = 24
Counting Numbers

9. What are the first five
multiples of 13?
13 x 1 =13
13 x 2 = 26
13 x 3 = 39 13, 26, 39, 52, 65
13 x 4 = 52
13 x 5 = 65

10. Find the Missing Multiples
24 30
• 6, 12, 18, ____, ____
3 15 18
• ___, 6, 9, 12, ____, ____, 21
12 72
• ___, 24, 36, 48, 60, ____

11. Prime and Composite
Numbers
Prime numbers are Composite numbers
numbers that only have have more than two
two factors: one, and the factors.
number itself.
EXAMPLES:
EXAMPLES: 6, 18, 30, 100
3, 5, 7, 11, 31