21/100 = 21%
A value like 21/100, or 21%, can show up in everyday life as a sale discount, a test score, or the amount of a budget spent on one category. For example, a store might take 21% off a jacket, or a weather report might say there is a 21% chance of rain.
To picture 21%, imagine a group of 100 items with 21 of them highlighted. It is a little more than one-fifth, since 20% is exactly one-fifth, so you can quickly estimate it as about one out of every five.
A common mistake is thinking 21% means 21 out of 10 instead of 21 out of 100. It is also easy to confuse a 21% discount with paying 21% of the original price, when a 21% discount means you still pay the remaining 79%.
