21/30 = 70%
A value of 70% can show up in everyday life when a store advertises a sale, a weather forecast gives the chance of rain, or a teacher reports a test score. It means the amount is more than half, but not quite three-quarters.
To picture 21/30 quickly, imagine 30 equal items with 21 shaded or selected. You can also think of it as about 7 out of every 10, which makes it easy to estimate in your head.
A common mistake is to treat 70% as if it means 70 items, no matter how many there are. The percentage describes a share of the whole, so the actual amount depends on what the total is.
