Example:
-1/2+1/4
Common denomenators:
-2/4+1/4
Add -2+1 which is equal to -1
Your answer would be -1/4
Always move the sign (+ or -) to the top. the bottom will not change after they become the same (Unless you have to simplify the fraction once the equation has been solved.)
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only if the positive fraction is "larger" than the negative one.
When you add: a negative and a negative: you get a negative a positive and a positive: you get a positive a positive and a negative or a negative and a positive: Subtract the addend with the smaller value from the greater one. If the greater one is positive, your answer will be positive. If the greater addend is negative, your answer will be negative.
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when you add two positive integers the answer is always positive when you add two negative integers the answer is positive when you add one negative and on positive integer, the answer is negative subtracting two negative numbers gets a negative answer subtracting two positive numbers- the answer depends subtracting a negative and positive number- the answer depends, the positive number would have to be bigger than the negative to achieve a negative number, and if the positive number is less, than the answer is still negative
The sum will take on the sign of whichever one is greater.