Part of the Fibonacci Series, where each term is the sum of the previous 2 terms.
Named after Leonard of Pisa.
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5-8-13-21-34-56-90.... The next number is the sum of the two previous numbers. This is the Fibonacci sequence, 1-1-2-3-5-8-13-21-34-56-90 etc
21
The answer is 34. The full sequence is called the Fibonachi series. Your sequence is 3 5 8 13 21 3 + 5= 8 8 + 13 = 21 Therefore: 13 + 21 = 34
half of 21 = 10.5 half of 5 = 2.5 10.5 - 2.5 = 8 10.5 + 2.5 = 13 13 + 8 = 21 13 - 8 = 5
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34