84 (number) facts for kids
Eighty-four is a fascinating number that comes right after 83 and before 85. It is an even number, which means you can divide it by two without any remainder. Numbers like 84 are everywhere, from sports scores to calendars, and they have many interesting properties.
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What Makes 84 Special?
Eighty-four is known as a composite number. This means it has more than two factors (numbers that divide into it evenly). Its factors include 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84 itself.
Prime Factors of 84
Every composite number can be broken down into its prime factors. Prime numbers are numbers greater than 1 that can only be divided by 1 and themselves (like 2, 3, 5, 7). For 84, its prime factors are 2, 2, 3, and 7. You can write this as 2 × 2 × 3 × 7 = 84.
Triangular Number
Eighty-four is also a triangular number. Imagine arranging dots in the shape of a triangle. A triangular number is the total number of dots in such a shape. Eighty-four is the 13th triangular number, meaning if you add up all the numbers from 1 to 13 (1+2+3+...+13), you get 84.
Where Do We See 84?
The number 84 appears in many different places, from sports to science and even history.
In Sports
- In American football, 84 is a common jersey number for wide receivers or tight ends.
- Many sports statistics, like points scored or games played, can involve the number 84.
In Science
- In chemistry, 84 is the atomic number of the element Polonium. Polonium is a rare and radioactive metal.
- In astronomy, some celestial cycles or measurements might involve the number 84.
In Time and Calendars
- A period of 84 years is sometimes called a great cycle in some ancient calendars or astronomical calculations.
- There are 84 days in 12 weeks, which can be useful for planning longer projects.
See also
- Eighty-three
- Eighty-five
- Even number
- Ochenta y cuatro para niños (Eighty-four for children in Spanish)
