math help

What is 30/50 + 1/11?

What is 30/50 + 1/11?

Let's add

30
50
+
1
11

Step 1

We can't add two fractions with different denominators (the bottom number). So you need to get a common denominator - both bottom numbers need to match. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator.

So we multiply 30 by 11, and get 330, then we multiply 50 by 11 and get 550.

30/50 times 11

Do the same for the second term. We multiply 1 by 50, and get 50, then multiply 50 by 11 and get 550.

1/11 times 50

So now our fractions look like this:

330
550
+
50
550

Step 2

Since our denominators match, we can add the numerators.

330 + 50 = 380

Now we have an answer.

380
550

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:

380
550
÷ 2 =
190
275

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:

190
275
÷ 5 =
38
55

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 7...

No good. So next you try the next prime number, which is 11...

No good. So next you try the next prime number, which is 13...

No good. So next you try the next prime number, which is 17...

No good. So next you try the next prime number, which is 19...

No good. So next you try the next prime number, which is 23...

No good. So next you try the next prime number, which is 29...

No good. So next you try the next prime number, which is 31...

No good. So next you try the next prime number, which is 37...

No good. So next you try the next prime number, which is 41...

No good. 41 is larger than 38. So we're done reducing.

And we're done! Here's the final answer to 30/50 + 1/11

30
50
+
1
11
=
38
55
© 2014 Randy Tayler