Magic with Pure Numbers: Adding Fibonacci Series
1 3 5 13 Add any 10 numbers of a Fibonacci series (Series which each number is the sum of the two preceding numbers). 7 Notice: the 7th number 59 3 10 13 23 36 59 95 154 249
How does this work? F (1) = a
F (2) = b
F ( n ) = F ( n − 1) + F ( n − 2 )
a b a+b a + 2b 2a + 3b 3a + 5b 5a + 8b 8a + 13b 13a + 21b 21a + 34b 55a + 88b 11(5a + 8b)
Leonardo Fibonacci (born 1170) recognized that Hindu-‐Arabic numerals are simpler than Roman numerals! His published book Liber Abaci pushed for the use of 0-‐9 digits and decimal. It showed the importance of the new numeral system and impacted European thought. Hindu-‐Arabic Numerals 1999 + 1998 -‐-‐-‐-‐-‐-‐ 3997
Roman Numerals MCMXCIX + MCMXCVIII -‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ = MMMCMXCVII