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2015-09-15T22:19:33+08:00

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4/7 + 3/21 + 4/14 = 24/42 + 6/42 + 12/ 42 = 42/42 or 1
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2015-09-16T09:40:11+08:00

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You may first reduce each fraction to lowest term:
4/7 = 4/7 (lowest term)
3/21 = 1/7 (lowest term)
4/14 = 2/7 ( lowest term)

Notice that they have the same denominators in the lowest term and are now similar terms, so add the numerators.

4/7 + 1/7 + 2/7 = 7/7  or 1

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