math help

What is 100/100 + 2/8?

What is 100/100 + 2/8?

Here's how to add

100
100
+
2
8

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 100 by 8, and get 800, then we multiply 100 by 8 and get 800.

100/100 times 8

Do the same for the second term. We multiply 2 by 100, and get 200, then multiply 100 by 8 and get 800.

2/8 times 100

The problem now has new fractions to add:

800
800
+
200
800

Step 2

Since our denominators match, we can add the numerators.

800 + 200 = 1000

This yields the answer

1000
800

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:

1000
800
÷ 2 =
500
400

Let's try dividing by that again...

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

500
400
÷ 2 =
250
200

Let's try dividing by that again...

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

250
200
÷ 2 =
125
100

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...

Are both the numerator and the denominator evenly divisible by 5? Yes! So we reduce it:

125
100
÷ 5 =
25
20

Let's try dividing by that again...

Are both the numerator and the denominator evenly divisible by 5? Yes! So we reduce it:

25
20
÷ 5 =
5
4

Let's try dividing by that again...

No good. 5 is larger than 4. So we're done reducing.

There you have it! Here's the final answer to 100/100 + 2/8

100
100
+
2
8
=
5
4
© 2014 Randy Tayler