Rules
Before adding or subtracting fractions, we must ensure we have a.....
Common Denominator
1/3 + 4/3 =
5/3
7/8 - 4/8 =
3/8
Adding a negative number is the same as...
Subtracting
-3/4 + 2/4 =
-1/4
-2/5 - 2/5 =
-4/5
Subtracting a negative number is the same as...
Adding a positive
4/5 + (-2/3) =
2/15
8/9 - 10/9 =
-2/9
Once you're done adding or subtracting a fraction, you must make sure the fraction is....
Reduced
-3/7 + 2/3 =
5/21
7/12 - 1/4 =
1/3
In order to turn a Mixed Number into an improper fraction, you must...
Multiply the Denominator by the Whole Number, and then add the numerator.
5/4 + (-17/12)
-1/6
-2/5 - (-2/3) =
4/15