In 1200 he returned to Pisa and used the knowledge he had gained on his travels to write

*Liber abaci*in which he introduced the Latin-speaking world to the decimal number system.

The Fibonacci Series is a sequence of numbers first created by Leonardo Fibonacci in 1202, introduced in

*Liber abaci*and later named the

*Fibonacci sequence*in his honor. Read more about Fibonacci, Roman numerals and the decimal system on our previous blog post: Fibonacci—810 Years of Mathematical Magic.

Leonardo da Pisa (Fibonacci) |

- 1 = 1²
- 1 + 3 = 2²
- 1 + 3 + 5 = 3²
- 1 + 3 + 5 + 7 = 4²
- and suggests the general formula:
- 1 + 3 + ... + (2n-1) = n²

From this statement the famous Fibonacci numbers can be derived.

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, ...

where the first two numbers of
the series are 1 and 1 and each number afterward is defined as the sum
of the two previous terms, Fn = Fn - 2 + Fn - 1. (Though in Fibonacci's sequence the first number was 1 and the second number was two, the first one was assumed.) Read more at plus.maths.org.

If it seems too time-consuming to have to calculate the Fibonacci numbers yourself, use this Fibonacci Calculator. It calculates thousands of Fibonacci numbers exactly and millions upon millions to the first few digits.

Click this image to view correlations |

Excel Math Student Lesson Sheets are much more than just math worksheets. Using strategically placed spaced repetition, Excel Math gives you a proven approach to teach math concepts for long-term retention, with powerful features and advantages, including our proprietary Spiraling Strategy. Much like the Fibonacci spiral (which we'll visit in our blog post next week), concepts are reintroduced on a regular basis (with our unique method of spaced repetition) so they become a part of the student's longterm memory. Read the glowing reports from teachers, parents and principals around the country.

Learn more about how Excel Math can work for your students at excelmath.com. Excel Math is fully aligned to the Common Core and to state standards. Download correlations here.

This year, Fibonacci Day falls on the day after Thanksgiving. If you're celebrating, leave a comment in the box below to tell us what you'll be doing. From everyone at Excel Math, Have a wonderful Thanksgiving and Happy Fibonacci Day!

This year, Fibonacci Day falls on the day after Thanksgiving. If you're celebrating, leave a comment in the box below to tell us what you'll be doing. From everyone at Excel Math, Have a wonderful Thanksgiving and Happy Fibonacci Day!

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