This document discusses applications of numerical integration and differentiation in real life. Numerical integration was used in designing the PETRONAS Towers and Sydney Opera House. Historically, integration was used to find volumes of wine casks and other curved surfaces. Numerical differentiation is used in speedometers, odometers, and police radar guns to calculate speed and distance from tire rotations or time and distance measurements. Derivatives are also used in business to analyze profit and loss from graphed data.