Among the natural numbers, 11 is the next one after 10 and precedes 12; it is the first repdigit, and it is the smallest two-digit prime number. It is the fourth number to stay the same upside-down, after zero, one, and eight. Children can observe objects that are shaped like the number. They can make a pattern in the items that have multiples of eleven. Then, children can write the pattern in the form of words.

In astronomy, 11 is the atomic number of sodium. In the Periodic Table of Elements, the elements in Group 11 include sodium, roentgenium, and coinage metals. In physics, 11 is the number of dimensions in the M-theory. The sunspot cycle has an approximate period of eleven years. The asteroid belt is a constellation named after the asteroid M-11.

The stylized maple leaf on the Flag of Canada contains 11 points. The loonie is a five-sided polygon, and Sector 11 is the code for the Agriculture, Forestry, Fishing, and Hunting industry. In linguistics, 11 is a word that can mean “the last moment to do something.” Sometimes it indicates that something is in danger, or is an emergency. In Basque, the word hamaika has two meanings: infinite.

When talking about the number 11, you can start by discussing its significance. It’s the number of people in the world that are eleven. Its significance lies in its repetition; it’s a teen number, and it represents an object that has one. When you think about the number eleven, you’ll notice that it is similar to a group of ten, and it has the same meaning. It is also the first teen-oriented number.