math help

What is 2/5 + 3/10?

What is 2/5 + 3/10?

This is how to add

2
5
+
3
10

Step 1

We have to make sure the denominators are equal.

Since 5 is evenly divided by 10, we can multiply just one term to get a common denominator.

Multiply 2 by 2, and get 4, then we multiply 5 by 2 and get 10.

So now our fractions look like this:

4
10
+
3
10

Step 2

Since our denominators match, we can add the numerators.

4 + 3 = 7

Now we have an answer.

7
10

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...

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 7. So we're done reducing.

And we're done! Here's the final answer to 2/5 + 3/10

2
5
+
3
10
=
7
10
© 2014 Randy Tayler