what is the decimal of 13 1/8

We can do this by using some simple arithmetic: 

\(13 \frac{1}{8} = 13 + \frac{1}{8}\).

This lets us separate the sum and focus on finding \(\frac{1}{8}\). \(\frac{1}{8} = 0.125\) from simple long division, so we have 

\(13 + \frac{1}{8} = 13+ 0.125 = 13.125\). 

The decimal is 13.125

13.125