##### How to solve m/3n + 2/7n

label Algebra
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How to solve m/3n + 2/7n , I know the answer is 7n+6/21n but How did you get there? the app im using only says "cross multiply" to which iam getting 7nm+6n/21n^2.

Oct 21st, 2017

For this one you have to first find the least common denominator:

each denominator factors as follows

```(3)(n) and (7)(n)
```
```so they already have n in common, but because 7 and 3 cannot be further broken down,

```
```they are multiplied to form 21, ......so (21)(n) is your least common denominator
```
```then you have to multiply the fraction on the left by (7)/(7) and the fraction on the right by (3)(3), which would give you the right answer
. multiplying by 1 does not change the value of

each fraction but gets them into terms where you can add. You can't cross multiply with ```
```addition of fractions
```
Dec 10th, 2014

Thanks

Sep 3rd, 2015

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Oct 21st, 2017
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Oct 21st, 2017
Oct 22nd, 2017
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