math help

What is 100/100 + 11/12?

What is 100/100 + 11/12?

This is how to add

100
100
+
11
12

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 100 by 12, and get 1200, then we multiply 100 by 12 and get 1200.

100/100 times 12

Now for the second term. You multiply 11 by 100, and get 1100, then multiply 100 by 12 and get 1200.

11/12 times 100

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

1200
1200
+
1100
1200

Step 2

Since our denominators match, we can add the numerators.

1200 + 1100 = 2300

That gives us the sum, which is

2300
1200

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:

2300
1200
÷ 2 =
1150
600

Now, try the same number again.

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

1150
600
÷ 2 =
575
300

Now, try the same number again.

Nope. Try the next prime number, 3...

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

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

575
300
÷ 5 =
115
60

Now, try the same number again.

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

115
60
÷ 5 =
23
12

Now, try the same number again.

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

Nope. Try the next prime number, 11...

Nope. Try the next prime number, 13...

No good. 13 is larger than 12. So we're done reducing.

Congratulations! Here's your final answer to 100/100 + 11/12

100
100
+
11
12
=
23
12
© 2014 Randy Tayler

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