Astrological Chart Mathematical Calculator

I want to be able to enter a 3 digit number from 000 to 999 along with a decimal number from 0.01 up to 29.59. These are used to find common numbers in this manner - enter the number then add or subtract its own square root... (Budget: $250 - $750 USD, Jobs: C# Programming, Data Analysis, Mathematics, Matlab and Mathematica, Programming, Python, Statistics)