math help

What is 64/16 + 5/10?

What is 64/16 + 5/10?

Here's how we add

64
16
+
5
10

Step 1

Can you add yet? Nope! The denominators don't match. We need a common denominator. So next we take both denominators and multiply them. Next, take each numerator and multiply it by the denominator of the other term.

So, we multiply 64 by 10, and get 640, then we multiply 16 by 10 and get 160.

64/16 times 10

Now for the second term. You multiply 5 by 16, and get 80, then multiply 16 by 10 and get 160.

5/10 times 16

We now have a new problem, that looks like this:

640
160
+
80
160

Step 2

Since our denominators match, we can add the numerators.

640 + 80 = 720

That gives us the sum, which is

720
160

Step 3

Now, do we need to simplify this fraction?

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

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

720
160
÷ 2 =
360
80

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

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

360
80
÷ 2 =
180
40

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

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

180
40
÷ 2 =
90
20

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

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

90
20
÷ 2 =
45
10

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...

Are both the numerator and the denominator evenly divisible by 5? Yes! So we reduce it:

45
10
÷ 5 =
9
2

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

No good. 5 is larger than 2. So we're done reducing.

And we're done! Here's the final answer to 64/16 + 5/10

64
16
+
5
10
=
9
2
© 2014 Randy Tayler