math help

What is 72/63 + 1/9?

What is 72/63 + 1/9?

Here's how you add

72
63
+
1
9

Step 1

Our denominators (bottom numbers) don't match, so we can't add yet.

63 goes into 9 evenly, so we only need to multiply one term to get a common denominator.

Multiply 1 by 7, and get 7, then we multiply 9 by 7 and get 63.

1/9 times 7

This gives us a new problem that looks like so:

72
63
+
7
63

Step 2

Since our denominators match, we can add the numerators.

72 + 7 = 79

That gives us an answer of

79
63

Step 3

Can this fraction be reduced?

First, we attempt to divide it by 2...

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...

Nope. Try the next prime number, 37...

Nope. Try the next prime number, 41...

Nope. Try the next prime number, 43...

Nope. Try the next prime number, 47...

Nope. Try the next prime number, 53...

Nope. Try the next prime number, 59...

Nope. Try the next prime number, 61...

Nope. Try the next prime number, 67...

No good. 67 is larger than 63. So we're done reducing.

Congratulations! Here's your final answer to 72/63 + 1/9

72
63
+
1
9
=
79
63
© 2014 Randy Tayler