math help

What is 36/4 + 2/5?

What is 36/4 + 2/5?

Here's how you add

36
4
+
2
5

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 36 by 5, and get 180, then we multiply 4 by 5 and get 20.

36/4 times 5

Now for the second term. You multiply 2 by 4, and get 8, then multiply 4 by 5 and get 20.

2/5 times 4

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

180
20
+
8
20

Step 2

Since our denominators match, we can add the numerators.

180 + 8 = 188

That gives us the sum, which is

188
20

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:

188
20
÷ 2 =
94
10

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:

94
10
÷ 2 =
47
5

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. 7 is larger than 5. So we're done reducing.

And we're done! Here's the final answer to 36/4 + 2/5

36
4
+
2
5
=
47
5
© 2014 Randy Tayler