Magnitude in mathematics is like a way of measuring how big something is. Imagine you have different numbers on a number line, like a ruler. Some of the numbers are small, like 1, and some are big, like 100. Magnitude is used to compare how big the numbers are in relation to each other. It tells us which numbers are larger or smaller than others. For example, if you have two numbers 4 and 8, the magnitude of 8 is greater than that of 4. Magnitude is a way to help us understand and compare numbers in a mathematical way.