Arbitrary-precision arithmetic

Arbitrary-precision arithmetic is like math, but it lets you use numbers that are bigger than the usual numbers we use. For example, regular math usually handles whole numbers (like 5, 10, or 100), and decimals (like 3.14 or 6.28). But with arbitrary-precision arithmetic, you can use really big numbers (like 1,000,000,000,000,000,000) or really small numbers (like 0.0000000000000001).