math help

What is 7/14 + 5/8?

What is 7/14 + 5/8?

This is how to add

7
14
+
5
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 7 by 8, and get 56, then we multiply 14 by 8 and get 112.

7/14 times 8

Do the same for the second term. We multiply 5 by 14, and get 70, then multiply 14 by 8 and get 112.

5/8 times 14

The problem now has new fractions to add:

56
112
+
70
112

Step 2

Since our denominators match, we can add the numerators.

56 + 70 = 126

This yields the answer

126
112

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:

126
112
÷ 2 =
63
56

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...

Are both the numerator and the denominator evenly divisible by 7? Yes! So we reduce it:

63
56
÷ 7 =
9
8

Now, try the same number again.

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

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

Congratulations! Here's your final answer to 7/14 + 5/8

7
14
+
5
8
=
9
8
© 2014 Randy Tayler