7. Addition and Subtraction of Fractions

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Recall that to add or subtract fractions, we need to have the same denominator.

Example 1

math expression

Here, the lowest common denominator which we can use is 15. So we have:

math expression

Subtraction works in the same way, as we see in the next example.

Example 2

math expression

Example 3

math expression

Example 4

math expression

Exercises

Simplify the following.

(1) math expression

(2) math expression

(3) math expression

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