What number added to 1/3 plus 1/4 equal the number 1?  

5/12 if i not wrong yea , not sure how to explain lol

Here is how to do this one...we want to know what number (call it x) added to 1/3 plus 1/4 = 1

So, we have x + 1/3 + 1/4 = 1

I like to clear fractions. Both 3 and 4 (the denominator of the fractions) are both factors of 12. So, I am going to multiply everything by 12. (Sometimes, I say it this way...if you were going to find a common denominator for the fractions, what would it be? It would be 12).

12(x) + 12(1/3) + 12(1/4) = 12(1) We multiply everything by 12.

We get: 12x + 4 + 3 = 12
Simplify: 12x + 7 = 12
Isolate the variable: 12x + 7 - 7 = 12 - 7
Finish up: 12x = 5
Divide both sides by 12

(12/12)x = 5/12
x = 5/12

Here is another way to solve it.

x + 1/3 + 1/4 = 1

Find the common denominator for the fractions. It is 12.
Rewrite the equation using the common demonimator.

x + 4/12 + 3/12 = 12/12

x + 7/12 = 12/12

x + 7/12 - 7/12 = 12/12 - 7/12
x = 5/12

And...good job to the other poster with this answer!

Let the number required be x

Then our equation will be

1/3 + 1/4 + x = 1

7/12 + x = 1

x = 1 - 7/12

x = 12-7/12

x = 5/12

So the number required is 5/12 !

5/12. the reasoning--12/12=1. 1/3 of this is 4/12, and 1/4 of this is 3/12. 3/12+ 4/12=7/12 + 5/12=1.