(3)

What is the denominator in 7/8?

_____________

The denominator in 7/8 is 8.

(4)

What is the denominator in 12/5?

_____________

The denominator in 12/5 is 5.

a. When fractions have the same number in the denominator, they are said to

have COMMON DENOMINATORS. For example: 1/8, 2/8, 5/8, 7/8, and 3/8 all have a

COMMON DENOMINATOR of 8.

b. Sometimes there is a need in mathematics to find a common denominator.

For example, before fractions may be added or subtracted, the denominators of all the

fractions in the problem must be the same.

c.

The following rules must be applied when working with fractions:

(1)

If the numerator and the denominator of a fraction are multiplied by the

same number, the value will not change.

For example: Multiply the numerator and denominator of 1/2 by 2.

2x2= 4

1x2 = 2

2x2

4 then: 4 x 2 8 , and so forth.

In this example: 1/2, 2/4, and 4/8 all have the same value.

(2)

If the numerator and the denominator of a fraction are divided by the

same number, the value of the fraction will not change.

For example:

22 =1

42=2

8 2 4 then: 4 2 2 , and so forth.

Again: 4/8, 2/4, and 1/2 all have the same value.

d.

To find a COMMON DENOMINATOR for the fractions 1/4, 3/8, and 5/16:

(1)

Find the largest denominator.

(The largest denominator is 16.)

MD0802

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