In the Fibonacci sequence each number is the sum of the previous two. The sequence therefore looks like this: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, etc. Forex traders use Fibonacci retracements as a method of technical analysis for determining support and resistance levels. Forex traders do not use the sequence, but the ratios between the numbers, which are: 61.8%, 50%, 38,2% and 23.6%. The 61.8% ratio is derived by dividing any number in the sequence by the number immediately following it, e.g.: 8/13=0.618. The 38.2% ratio is found by dividing any number in the sequence by the number that is found two places to the right, e.g.: 8/21=0.382. The 23.6% ratio is found by dividing any number in the sequence by the number that is three places to the right, e.g.: 8/34=0.236.