math help

What is 36/4 + 5/9?

What is 36/4 + 5/9?

Here's how you add

36
4
+
5
9

Step 1

Of course, you can't add two fractions if the denominators (bottom numbers) don't match. To get a common denominator, multiply the denominators together. Then we fix the numerators by multiplying each one by their other term's denominator.

Now you multiply 36 by 9, and get 324, then we multiply 4 by 9 and get 36.

36/4 times 9

Do the same for the second term. We multiply 5 by 4, and get 20, then multiply 4 by 9 and get 36.

5/9 times 4

The problem now has new fractions to add:

324
36
+
20
36

Step 2

Since our denominators match, we can add the numerators.

324 + 20 = 344

The sum we get is

344
36

Step 3

The last step is to reduce the fraction if we can.

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:

344
36
÷ 2 =
172
18

Let's try dividing by that again...

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

172
18
÷ 2 =
86
9

Let's try dividing by that again...

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

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...

No good. 11 is larger than 9. So we're done reducing.

There you have it! Here's the final answer to 36/4 + 5/9

36
4
+
5
9
=
86
9
© 2014 Randy Tayler