Fourth graders learned about the Fibonacci sequence today in an integrated math and library class. The Fibonacci sequence, invented by Leonardo Bonacci, is one of the most famous formulas in mathematics. Each number in the sequence is the sum of the two numbers that precede it. The sequence goes: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on. The sequence is used in computing, stock trading, and architecture and design. Tomorrow, November 23, is Fibonacci Day since the number sequence of the date is 1123 (the first four numbers of the sequence). Fourth graders learned about the sequence and then listened to a read-aloud about Leonardo Fibonacci.