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Answer: **17**

First, find a pattern in the grid that repeats. The only repeating pattern on this grid that eventually uses all the numbers is **2 numbers on a horizontal row, with another number between them on the row below**.

Looking at this pattern, we can see that the bottom number is the **sum of the DIGITS** of the two numbers above.

**25**= 8 + 8 + 6 + 3**16**= 2 + 5 + 9**13**= 1 + 6 + 2 + 4

The missing number will therefore be 1 + 3 + 4 + 9 = **17**.

The pattern would then continue:

**9**= 1 + 7 + 1 + 0

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