math help

What is 11/12 + 3/7?

What is 11/12 + 3/7?

Here's how you add

11
12
+
3
7

Step 1

We still have different denominators (bottom numbers), though, so we need to get a common denominator. This will make the bottom numbers match. Multiply the denominators together first. Now, multiply each numerator by the other term's denominator.

Now we multiply 11 by 7, and get 77, then we multiply 12 by 7 and get 84.

11/12 times 7

Now for the second term. You multiply 3 by 12, and get 36, then multiply 12 by 7 and get 84.

3/7 times 12

This gives us a new problem that looks like so:

77
84
+
36
84

Step 2

Since our denominators match, we can add the numerators.

77 + 36 = 113

That gives us an answer of

113
84

Step 3

Can this fraction be reduced?

First, we attempt to divide it by 2...

Nope! So now we try the next greatest prime number, 3...

Nope! So now we try the next greatest prime number, 5...

Nope! So now we try the next greatest prime number, 7...

Nope! So now we try the next greatest prime number, 11...

Nope! So now we try the next greatest prime number, 13...

Nope! So now we try the next greatest prime number, 17...

Nope! So now we try the next greatest prime number, 19...

Nope! So now we try the next greatest prime number, 23...

Nope! So now we try the next greatest prime number, 29...

Nope! So now we try the next greatest prime number, 31...

Nope! So now we try the next greatest prime number, 37...

Nope! So now we try the next greatest prime number, 41...

Nope! So now we try the next greatest prime number, 43...

Nope! So now we try the next greatest prime number, 47...

Nope! So now we try the next greatest prime number, 53...

Nope! So now we try the next greatest prime number, 59...

Nope! So now we try the next greatest prime number, 61...

Nope! So now we try the next greatest prime number, 67...

Nope! So now we try the next greatest prime number, 71...

Nope! So now we try the next greatest prime number, 73...

Nope! So now we try the next greatest prime number, 79...

Nope! So now we try the next greatest prime number, 83...

Nope! So now we try the next greatest prime number, 89...

No good. 89 is larger than 84. So we're done reducing.

There you have it! Here's the final answer to 11/12 + 3/7

11
12
+
3
7
=
113
84
© 2014 Randy Tayler