Fill in the missing number: 0,1,1,2,3,5,8,13,-,34,55?

Find the missing number. Explain step by step and show your work.

This is known as the Fibonacci sequence. Each value is obtained by adding up the two previous numbers.
To find the next number, just add the two numbers before it and you get 8 + 13 = 21
So the missing number is 21.

0 1 1 2 3 5 8 13 34 55

4

This is the Fibonacci sequence- each number is the sum of the two preceding ones.
Hence the missing number is 8 + 13 = 21.

Fibbonacci sequence
Next time you’re at the supermarket look at a fresh, whole pineapple.
The ‘stacks’ of triangular section appear to be 8 high
with 5 diagonal rows of 3 each

Answer 6

21.