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Transcript 
Greatest Common Factor and
Least Common Multiples
GCF and LCM
What is the difference between
a factor and a multiple?
Factor:
An integer that divides evenly
(no remainder) into a number
Factors of 6 are: 1, 2, 3, 6
Multiple:
The product of a number and
any natural number
Some multiples of 6: 6, 12, 18,
24……
Give me an example of a factor
of 15
Give me an example of a
multiple of 15
How would you find the GCF of
60 and 96?
You simply write out all the
factors for each number. Then
find the greatest number. I like
to circle the numbers by using
columns.
List the factors of 60:
1,2,3,4,5,6,10,12,15,20,30,60
List the factors of 96
1,2,3,4,6,8,12,16,24,32,48,96
find the largest factor - 12
Find the GCF of 36 and 24
Find the LCM of 12 and 18
Multiples of 12 are…
12,24,36,48,60,72,….
Multiples of 18 are…
18,36,54,72,90,108,…
The smallest multiple the 2
numbers have in common is the
least common multiple.
Find the LCM of 18 and 12
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