math help

What is 64/4 + 6/7?

What is 64/4 + 6/7?

Here's how we add

64
4
+
6
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 64 by 7, and get 448, then we multiply 4 by 7 and get 28.

64/4 times 7

Now for the second term. You multiply 6 by 4, and get 24, then multiply 4 by 7 and get 28.

6/7 times 4

This gives us a new problem that looks like so:

448
28
+
24
28

Step 2

Since our denominators match, we can add the numerators.

448 + 24 = 472

That gives us an answer of

472
28

Step 3

Can this fraction be reduced?

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

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

472
28
÷ 2 =
236
14

Let's try dividing by that again...

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

236
14
÷ 2 =
118
7

Let's try dividing by that again...

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...

No good. 11 is larger than 7. So we're done reducing.

There you have it! Here's the final answer to 64/4 + 6/7

64
4
+
6
7
=
118
7
© 2014 Randy Tayler