math help

What is 2/10 + 10/12?

What is 2/10 + 10/12?

This is how to add

2
10
+
10
12

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 2 by 12, and get 24, then we multiply 10 by 12 and get 120.

2/10 times 12

Do the same for the second term. We multiply 10 by 10, and get 100, then multiply 10 by 12 and get 120.

10/12 times 10

The problem now has new fractions to add:

24
120
+
100
120

Step 2

Since our denominators match, we can add the numerators.

24 + 100 = 124

This yields the answer

124
120

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:

124
120
÷ 2 =
62
60

Now, try the same number again.

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

62
60
÷ 2 =
31
30

Now, try the same number again.

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

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

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

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

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

Nope. Try the next prime number, 17...

Nope. Try the next prime number, 19...

Nope. Try the next prime number, 23...

Nope. Try the next prime number, 29...

Nope. Try the next prime number, 31...

No good. 31 is larger than 30. So we're done reducing.

Congratulations! Here's your final answer to 2/10 + 10/12

2
10
+
10
12
=
31
30
© 2014 Randy Tayler