Fibonacci number facts for kids
The Fibonacci numbers are a sequence of numbers in mathematics named after Leonardo of Pisa, known as Fibonacci. Fibonacci wrote a book in 1202, called Liber Abaci. There he introduced the number pattern to Western European mathematics, although mathematicians in India already knew about it.
The first number of the pattern is 0, the second number is 1, and each number after that is equal to adding the two numbers before it together. For example 0+1=1 and 3+5=8. This sequence can go on forever.

F_{0} F_{1} F_{2} F_{3} F_{4} F_{5} F_{6} F_{7} F_{8} F_{9} F_{10} F_{11} F_{12} F_{13} F_{14} F_{15} F_{16} F_{17} F_{18} F_{19} F_{20} 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765
Fibonacci numbers in nature
Fibonacci numbers are related to the golden ratio, which shows up in many places in buildings and in nature. Some examples are the pattern of leaves on a stem, the parts of a pineapple, the flowering of artichoke, the uncurling of a fern and the arrangement of a pine cone. The Fibonacci numbers are also found in the family tree of honeybees.
Images for kids

A page of Fibonacci's Liber Abaci from the Biblioteca Nazionale di Firenze showing (in box on right) the Fibonacci sequence with the position in the sequence labeled in Latin and Roman numerals and the value in HinduArabic numerals.