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I assume you want to convert two fractions to a common denominator. Let's see an example. You want to add, subtract, or compare 1/4 and 5/6. The least common denominator is 12 - I assume you already know how to find that. It need not be the least common denominator; any common denominator - for example, the product of the two denominators - will work.

However, let's assume you want to convert to twelfths. To convert the fractions to twelfths, you do the following. To convert 1/4 to ?/12, note that the number 4 must be multiplied by 3 to get 12. In that case, the numerator, 1, must also be multiplied by 3. Thus, you get 3/12. Similarly, to convert 5/6 to ?/12, you need to multiply the bottom (and therefore also the top) by 2, so you get 10/12.

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Q: How can you find the missing numerator with the same denominator?
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The same numerator as which numerator and the same denominator as which denominator?


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Well, isn't that just a happy little accident! If you're missing a numerator or denominator in a fraction, you can use what you know to solve for it. Look at the known parts of the fraction and use basic math to figure out the missing piece. Just remember, there are no mistakes, only happy little discoveries in the world of numbers!


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