math help

What is 91/6 + 3/4?

What is 91/6 + 3/4?

This is how to add

91
6
+
3
4

Step 1

We can't add two fractions with different denominators (the bottom number). So you need to get a common denominator - both bottom numbers need to match. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator.

So we multiply 91 by 4, and get 364, then we multiply 6 by 4 and get 24.

91/6 times 4

Do the same for the second term. We multiply 3 by 6, and get 18, then multiply 6 by 4 and get 24.

3/4 times 6

So now our fractions look like this:

364
24
+
18
24

Step 2

Since our denominators match, we can add the numerators.

364 + 18 = 382

So the answer is:

382
24

Step 3

Last of all, we need to simplify the fraction, if possible. Can it be reduced to a simpler fraction?

To find out, we try dividing it by 2...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

382
24
÷ 2 =
191
12

So far so good... let's try to divide by that number again.

No good. So next you try the next prime number, which is 3...

No good. So next you try the next prime number, which is 5...

No good. So next you try the next prime number, which is 7...

No good. So next you try the next prime number, which is 11...

No good. So next you try the next prime number, which is 13...

No good. 13 is larger than 12. So we're done reducing.

And we're done! Here's the final answer to 91/6 + 3/4

91
6
+
3
4
=
191
12
© 2014 Randy Tayler