math help

What is 3/24 + 3/10?

What is 3/24 + 3/10?

Here's how you add

3
24
+
3
10

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 3 by 10, and get 30, then we multiply 24 by 10 and get 240.

3/24 times 10

Do the same for the second term. We multiply 3 by 24, and get 72, then multiply 24 by 10 and get 240.

3/10 times 24

So now our fractions look like this:

30
240
+
72
240

Step 2

Since our denominators match, we can add the numerators.

30 + 72 = 102

So the answer is:

102
240

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:

102
240
÷ 2 =
51
120

Now, try the same number again.

Nope. Try the next prime number, 3...

Are both the numerator and the denominator evenly divisible by 3? Yes! So we reduce it:

51
120
÷ 3 =
17
40

Now, try the same number again.

Nope. Try the next prime number, 5...

Nope. Try the next prime number, 7...

Nope. Try the next prime number, 11...

Nope. Try the next prime number, 13...

Nope. Try the next prime number, 17...

Nope. Try the next prime number, 19...

No good. 19 is larger than 17. So we're done reducing.

Congratulations! Here's your final answer to 3/24 + 3/10

3
24
+
3
10
=
17
40
© 2014 Randy Tayler