Hint: In order to solve this problem we need to know that predecessor means the number just before the number provided. Subtracting one from the given number will solve your problem.
Complete step-by-step answer:
The number given is 208090. We need to find the predecessor of the given number.
We know that the predecessor of the number means that the number just before the given number. The predecessor of a number can be obtained by subtracting 1 from the number.
So we do: 208090 - 1 = 208089.
Hence the answer to this question is 208089.
Note: In this question you just need to know that the number which comes immediately before a particular number is called its predecessor. The predecessor of a whole number is the number obtained by subtracting 1 from it. Your problem will be solved by knowing this concept.