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Do you have to change the denominators when multiplying fractions?
No. To multiple fractions multiple the numerators together and multiply the denominators together and simplify (by dividing both numerator and denominator of the result by common factors until the only common factor is 1). The denominators only need to be the same when adding or subtracting fractions.
Subtracting fractions with unlike denominators?
You must change the denominators so they are the same: eg 5/12 - 1/8 first multiply 5/12 by 2 = 10/24 then multiply 1/8 by 3 = 3/24 now both fractions have the same denominators, subtract 3 from 10 10/24 - 3/24 = 7/24
How do you multiply fractions that have the same denominator?
you don't do anything. you just multiply it together unless on the numerator you can reduce it with one of the denominators. ================================= On the remote chance that perhaps you find the first answer unclear, here's another explanation: To multiply two fractions: -- Multiply their numerators. That product is the numerator of the answer. -- Multiply their denominators. That product is the denominator of the answer. -- Now you have the answer. It may be possible to simplify it (reduce it to lower terms). It's not necessary for the original two fractions to have the same denominator. Just follow the same two easy steps to multiply the fractions, whether their denominators are the same or different.
Adding mixed numbers with unlike denominators?
First convert the mixed numbers into "top heavy (or "improper) fractions". Now multiply each of the improper fractions by each other - this makes the denominators the same. Now you can add both the fractions together (and cancel down if necessary).
How do you subtract improper fractions with different denominators?
It's the same thing as adding or subtracting normal fractions - just make sure both fractions have the same denominators (by either multiplying the denominators or simplifying the fraction - whichever the question needs).
