What is the missing number? 0, 1, 1, 2, 3, 5, 8, __, 21, 34

[math_celebrity]

We can't add a common number of multiply a common number to solve this.

But what happens if we start at the 3rd term and add the 2 prior terms?

• 0 + 1= 1
• 1 + 1 = 2
• 1 + 2 = 3
• 3 + 5 = 8
• 5 + 8 = 13

This is known as the Fibonacci Sequence.