math help

What is 80/2 + 3/10?

What is 80/2 + 3/10?

Here's how we add

80
2
+
3
10

Step 1

We have to make sure the denominators are equal.

10 goes into 2 evenly, so we only need to multiply one term to get a common denominator.

Multiply 80 by 5, and get 400, then we multiply 2 by 5 and get 10.

80/2 times 5

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

400
10
+
3
10

Step 2

Since our denominators match, we can add the numerators.

400 + 3 = 403

That gives us the sum, which is

403
10

Step 3

Now, do we need to simplify this fraction?

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

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. So next you try the next prime number, which is 11...

No good. 11 is larger than 10. So we're done reducing.

And we're done! Here's the final answer to 80/2 + 3/10

80
2
+
3
10
=
403
10
© 2014 Randy Tayler