ANSWERS:

5

True

3

(1)

6

or

3

8

4

(2)

1

17

We may add or subtract fractions only if they have a common denominator.

If they do not have a common denominator, they must be converted to a common denominator

before adding or subtracting.

We may not add: 1

+1

+1

yet, because the denominators are

4

2

6

the same.

In order to add fractions such as 1

+1

+ 1, we must change the

4

2

6

denominators to make them the

.

The procedure for making the denominators the same is called finding the least common

denominator.

The least common denominator is also called the lowest or smallest common denominator.

It is called least or lowest because it is the smallest number that we can use as a common

denominator.

The smallest number that we can use as a common denominator is called the

.

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