|
Factors
are two or more numbers
that are multiplied to give a product. 2 x 5
= 10
factors of 10
| Common
factor is a number that is a factor of two
or more products. |
 |
1
x 18 =
18 |
| 2
x 9 = 18 |
| 3
x 6 = 18 |
| 9
x 2 = 18 |
| The factors of
18 are: 1, 2, 3,
6, 9, 18. |
 |
| The factors of
24 are: 1, 2, 3, 4, 6,
8, 12, 24. |
The common factors of 18
and 24 are: 1,
2, 3, 6. |
The
greatest common factor (GCF) of two or more products is the greatest
number that is a factor of those products.
Example:
What is the greatest common factor (GCF)
of 24 and 18? |
|
24:
factors are 1, 2, 3, 4,
6, 8, 12, 24. |
18:
factors are 1, 2, 3, 6,
9, 18. |
| 1
x 12 = 24 |
Write all the factors for
each number. Put the numbers in order from least to greatest.
Identify the common factors and then find the GCF. |
1
x 18 = 18 |
Write all the factors for
each number. Put the numbers in order from least to greatest.
Identify the common factors and then find the GCF. |
| 2
x 12 = 24 |
2
x 9 = 18 |
| 3
x 8 = 24 |
3
x 6 =
18 |
| 4
x 6 =
24 |
9
x 2 = 18 |
|
|
Hint:
Knowing how to find common factors of numbers, especially knowing
how to find the GCF, is an essential skill for writing fractions
in simplest form. |
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Practice
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