7 1/4 + 5 3/5 = reduced to it's lowest form

A. 13 3/10

B. 12 17/20

C. 12 7/10

D. 12 11/20

How is this solved?

7 1/4 + 5 3/5

First, you need a common denominator to add the two. 20 will work.

4x5=20, so we have to also multiply 1 by 5.

4x5=20, 1x5=5

5x4=20, so we have to also multiply 3 by 4.

5x4=20, 3x4=12

And now we put the fractions back in.

7 5/20 + 5 12/20

And add them.

7 5/20 + 5 12/20 = 12 17/20

Now, we're supposed to reduce it to its lowest form.

Unfortunately, the fraction cannot be reduced, because 17 is a prime number, meaning there are no factors to it except one and itself.

Therefore, the lowest form of 12 17/20 is 12 17/20

Your answer is B, 12 17/20