87/100 = 87%
A score of 87% might show up on a test, a phone battery, or a weather forecast showing the chance of rain. It means the amount is close to the whole, but there’s still a small part missing.
To picture 87 out of 100, imagine a grid with 100 squares and 87 of them shaded. A quick estimate is “a little less than nine-tenths,” since nine-tenths would be 90 out of 100.
One common mix-up is treating 87% as if it means 87 out of 10, or as if it were the same as 87 whole items. The “per hundred” idea matters: the percentage describes a share of some total, which could be 100 items or another amount entirely.