Eleven is the number that comes after ten and before twelve. When you count on your fingers, you run out at ten and need to start over; eleven is one more than that. It's written as 11 in numerals.

In everyday life, eleven shows up constantly. A soccer team has eleven players on the field. If you're eleven years old, you're probably in fifth or sixth grade. When the clock shows 11:00, it's either late morning (almost lunchtime) or late at night.

Eleven is interesting mathematically because it's a prime number, meaning it can only be divided evenly by itself and one. It's also the first two-digit number where both digits are the same, which makes it easy to spot. In Spanish, once means eleven.

You might hear people use phrases like the eleventh hour, which means the last possible moment to do something, like finishing homework right before class starts.