Download Factors and Multiples

Factors, Common Factors,
and Greatest Common Factor (GCF)
Factors are numbers
that are multiplied
to get a product
(the math facts)
8 X 7 = 56
What does
“Find the
factors”
mean?
…find all the
numbers you can
multiply together to
get that number as
the product.
These rules will
help you find all of
the factors of any
given number!!
EVERY number
greater than 1 has
the number 1 and
itself as a factor.
When the factor is the same, you only
list it once (ex. 6 x 6 = 36)
Find the factors using a
factor rainbow:
1. 18
2. 24
3. 52
Write this example in
your journal
Find the factors using a
factor t-chart:
1. 12
2. 30
3. 66
Factors, Common Factors,
and Greatest Common Factor (GCF)
What does COMMON mean?
What does FACTORS mean?
So…..
COMMON FACTORS are:
Factors that two or more
numbers have in common… or
the same multiplication facts in
two or more numbers
24
16
1
2
4
16
8
4
1
2
3
4
24
12
8
6
Remember: Once you repeat a number you’re done!!
16: 1, 2, 4, 8, 16
24: 1, 2, 3, 4, 6, 8, 12, 24
Common Factors: 1, 2, 4, 8
What are the common factors of:
1. 6 & 9
Use either a Factor
2. 24 & 48
Rainbow or Factor
T-Chart to find the
3. 25 & 45
factors for each
number.
The greatest factor that both
numbers have in common.
GCF = Greatest Common Factor
9
1x9
3x3
12
1 x 12
2x6
3x4
9 : 1,3,9
12: 1,2,3,4,6,12
Find the GCF:
1.
2.
12 & 26
9 & 21