Definition: In mathematics, an approximation is a value that closely approximates a given number or expression. This can be done by using methods such as rounding, truncation, and interpolation. For example, if we have a real number "x", we might approximate it with a decimal form of x by truncating the decimal part to a certain number of digits (e.g., 0.123456789). This is an approximation because it provides an accurate representation of x within