Fractions can be added and subtracted easily if they have the same denominator.

Example: 2/7 + 3/7 = 5/7

3/7 − 2/7 = 1/7

If fractions don’t have the same denominator, they have to be changed to equivalent fractions first by finding the lowest common denominator (LCD).

[The lowest common denominator (LCD) can be obtained by finding the lowest common multiple (LCM) of the denominators.]

Example :

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