Rounding is a simple math technique used to make numbers easier to work with. When we round a number, we change it to the nearest whole number or a specific place value, like the nearest ten or hundred. For example, if we have the number 47, we can round it to 50 because it is closer to 50 than to 40. Rounding helps us estimate and simplify calculations, especially when dealing with large numbers. For instance, if we want to quickly add 23 and 78, we can round 23 to 20 and 78 to 80, making it easier to see that the sum is about 100.