You need a common denominator for both.
When you are adding or subtracting fractions.
When you are adding or subtracting fractions.
What is the definition of Adding and Subtracting Like Fractions
Subtracting a fraction is the same as adding its negative.
No only when adding or subtracting fractions a common denominator is needed
Anything having to do with adding or subtracting unlike fractions.
Not always but they need to have the same denominators when adding or subtracting them.
When adding or subtracting fractions their denominators must be the same
Ensure that the denominators are the same when adding or subtracting fractions.
Me
No, You only need a common denominator when adding or subtracting fractions.