Number conversion in decimal fraction

Question

980.85D convert to hexadecimal number = 3D4 . ??

how to solve the answer after the decimal point?

Thank you in advanced.

Answer 1

The first place after the point is sixteenths, so think $.85 = \frac{x}{16}$. So $x=16\cdot(.85)=13.6$. So the first hex digit is $D$. Then keep iterating this process (i.e., multiply the new decimal part by 16, and use the integer part of the result for the next hex digit) until the process terminates or you get repetition.