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March 16, 2010
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Basic Fraction
How Do I Solve A Basic Fraction Addition Problem With Uncommon Denominators?
Solving a basic fraction addition problem with uncommon denominators is not too tricky but does have a lot of steps. Let's start with the sample problem 3/5+4/15.
The first step is to look at the denominators. Five and fifteen are different, so we need to find a common denominator. Notice that five is a factor of fifteen. We can multiply 3/5 by 3/3 for an equivalent fraction of 9/15. Now we have 9/15+4/15, which is an addition problem with common denominators. You can add the numerators and keep the denominators the same for a sum of 13/15.
Your final step is to see if you can reduce the fraction. In this case, the fraction cannot be reduced because the numerator, thirteen, is not a factor of fifteen.
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