Answers

2014-08-25T14:25:59+08:00
Get the least common denominator first for them to be similar and then look up if the signs are similar. if the signs are both positive, it'll be positive. if the signs are negative, it should be negative but if the signs are not the same, get the sign with the bigger value. 

Remember. in subtracting, don't forget the additive inverse of the subtrahend and then proceed to addition.
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