because the denominator is the total, so there can't be two totals in one answer
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you must make the denominators the same first in order to add them once they are added, the denominators stay the same and the top combines
Not always but they need to have the same denominators when adding or subtracting them.
Yes. When multiplying and dividing fractions your denominators do not have to be the same. The denominators only haveto be the same if you are subtracting or adding them.
The denominators must be the same, the numerators can be different.
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.