math help

What is 100/24 + 8/9?

What is 100/24 + 8/9?

Let's add

100
24
+
8
9

Step 1

We still have different denominators (bottom numbers), though, so we need to get a common denominator. This will make the bottom numbers match. Multiply the denominators together first. Now, multiply each numerator by the other term's denominator.

Now we multiply 100 by 9, and get 900, then we multiply 24 by 9 and get 216.

100/24 times 9

Now for the second term. You multiply 8 by 24, and get 192, then multiply 24 by 9 and get 216.

8/9 times 24

This gives us a new problem that looks like so:

900
216
+
192
216

Step 2

Since our denominators match, we can add the numerators.

900 + 192 = 1092

So what's the answer so far?

1092
216

Step 3

Can this fraction be reduced?

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

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

1092
216
÷ 2 =
546
108

Let's try dividing by that again...

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

546
108
÷ 2 =
273
54

Let's try dividing by that again...

Nope! So now we try the next greatest prime number, 3...

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

273
54
÷ 3 =
91
18

Let's try dividing by that again...

Nope! So now we try the next greatest prime number, 5...

Nope! So now we try the next greatest prime number, 7...

Nope! So now we try the next greatest prime number, 11...

Nope! So now we try the next greatest prime number, 13...

Nope! So now we try the next greatest prime number, 17...

Nope! So now we try the next greatest prime number, 19...

No good. 19 is larger than 18. So we're done reducing.

There you have it! Here's the final answer to 100/24 + 8/9

100
24
+
8
9
=
91
18
© 2014 Randy Tayler