A few days ago
Jamie

What do you do if you are adding fractions and they have no common denominators?

Please tell me what you do if you have 2 fractions that ur adding and they have no comon denominators? TEST TOMORROW

Top 6 Answers
A few days ago
KC_Meag42

Favorite Answer

You must find a common denominator.

For example, if you are asked to add 2/5 and 1/3, you would find the smallest number that both numbers divide into… in this case, it is 15.

So set it up as x/15 and y/15. 5 goes into 15 three times, so multiply 3 by 2 and get 6/15. So 2/5 is same as 6/15. Do same for other and realize 1/3 is same as 5/15.

Then add 6 and 5 together and get 11.

So 2/5 + 1/3 = 11/15, and this does not simplify so your answer is 11/15.

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A few days ago
Deb S
Let’s say the fractions are 1/2 + 2/3. First you find the least common multiple of the denominators. That is 6 in this case then you multiply each fraction by a fraction that equals 1 so that 6 will be your denominator in each fraction. 1/2 x 3/3 = 3/6. 2/3 x 2/2 = 4/6. Then add the new fractions together. 3/6 + 4/6 = 7/6. Simplify the fraction: 1 1/6 is your answer. Hope that made sense!
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A few days ago
✰EEYORE✰
find the common denominator…so for example if you have

5/7+2/9

you have to find a common denominator…so find a number that both 7 and 9 are factors (?) of. the easiest way to do it is to multiply 5/7 by 9/9 and multiply 2/9 by 7/7. (you have to multiply by 9/9 or 7/7 so that the value of the fraction stays the same…sine both 9/9 and 7/7 equal 1, multiplying the fractions by them wont actually change their values)

so after multiplying the fractions, you end up with

45/63+14/63=59/63

then if its possible, simplify the fraction

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A few days ago
blufunkbmw
convert the fractions to equivalent ones with a common denominator. for example, 3/4 + 1/5 would convert to 15/20 + 4/20. the easiest way to find a common denominator is to multiply the denominators of the two fractions, then cross multiply the numerators-denominators to convert to equivalent fractions.
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A few days ago
Jake
If I understand you question, then you only need to multiply the denominators by eachother and the appropriate numerator.

4/7 + 2/3

7 x 3 = 21 and 7 x 2 = 14

4/7 + 14/21

3 x 7 = 21 and 3 x 4 = 12

12/21 + 14/21 = 26/21 = 1 5/21

I hope this helped.

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A few days ago
Claire
ok you find a number the numerators can both go into. Then multiply.
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