math help

What is 24/12 + 2/5?

What is 24/12 + 2/5?

Let's add

24
12
+
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 24 by 5, and get 120, then we multiply 12 by 5 and get 60.

24/12 times 5

Now for the second term. You multiply 2 by 12, and get 24, then multiply 12 by 5 and get 60.

2/5 times 12

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

120
60
+
24
60

Step 2

Since our denominators match, we can add the numerators.

120 + 24 = 144

Answer:

144
60

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:

144
60
÷ 2 =
72
30

Now, try the same number again.

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

72
30
÷ 2 =
36
15

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:

36
15
÷ 3 =
12
5

Now, try the same number again.

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

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

No good. 7 is larger than 5. So we're done reducing.

Congratulations! Here's your final answer to 24/12 + 2/5

24
12
+
2
5
=
12
5
© 2014 Randy Tayler