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anonymous
 5 years ago
how do you add fractions?
anonymous
 5 years ago
how do you add fractions?

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tim
 5 years ago
Best ResponseYou've already chosen the best response.0Do you have an example I could help you with? You need to find a common denominator (the number on the bottom).

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Here is a quick & easy shortcut for adding any fractions a/b + c/d. Start with d (mandatory) and cross multiply, giving da. Then cross multiply the other way, giving bc. Add (or subtract  this works for subtraction too) these two results. This is the top of the answer. For the bottom, just multiply straight across, giving bd. The result, then, is (da + bc) / bd. Just memorize the process, not this formula. Example: 2/5 + 4/9. The top is given by (9 x 2 + 5 x 4), or 38. The bottom is given by 5 x 9 or 45. Thus the answer is 38/45. Always check to see if the answer can be simplified (reduced).
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