👉 In computer science and mathematics, precalculations are calculations that are performed before a full calculation is done. They involve performing calculations on data that has already been stored or available from other sources. Precalculations can be used in various applications such as optimizing algorithms, reducing time complexity, and simplifying code for easier debugging. They are often used to speed up computer programs by avoiding unnecessary calculations that could be performed multiple times. Some examples of precalculations include: 1. Calculating the factorial of