math help

What is 20/64 + 4/8?

What is 20/64 + 4/8?

Here's how you add

20
64
+
4
8

Step 1

Now we need to make our denominators match.

Since 8 is evenly divided by 64, we can multiply just one term to get a common denominator.

Multiply 4 by 8, and get 32, then we multiply 8 by 8 and get 64.

4/8 times 8

So now our fractions look like this:

20
64
+
32
64

Step 2

Since our denominators match, we can add the numerators.

20 + 32 = 52

So the answer is:

52
64

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:

52
64
÷ 2 =
26
32

Let's try dividing by that again...

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

26
32
÷ 2 =
13
16

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...

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

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

No good. 17 is larger than 13. So we're done reducing.

There you have it! Here's the final answer to 20/64 + 4/8

20
64
+
4
8
=
13
16
© 2014 Randy Tayler