math help

What is 16/48 + 5/9?

What is 16/48 + 5/9?

Let's add

16
48
+
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 16 by 9, and get 144, then we multiply 48 by 9 and get 432.

16/48 times 9

Do the same for the second term. We multiply 5 by 48, and get 240, then multiply 48 by 9 and get 432.

5/9 times 48

The problem now has new fractions to add:

144
432
+
240
432

Step 2

Since our denominators match, we can add the numerators.

144 + 240 = 384

The sum we get is

384
432

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:

384
432
÷ 2 =
192
216

Let's try dividing by that again...

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

192
216
÷ 2 =
96
108

Let's try dividing by that again...

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

96
108
÷ 2 =
48
54

Let's try dividing by that again...

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

48
54
÷ 2 =
24
27

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:

24
27
÷ 3 =
8
9

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...

No good. 11 is larger than 8. So we're done reducing.

There you have it! Here's the final answer to 16/48 + 5/9

16
48
+
5
9
=
8
9
© 2014 Randy Tayler