Question
In the following numbers, replace * by the smallest number to make it divisible by 9:
538 * 8

Answer

538 * 8
Sum of the given digits = 5 + 3 + 8 + 8 = 24
The multiple of 9 which is greater than 24 is 27.
Therefore, the smallest required number = 27 - 24 = 3

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