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The greatest one-digit number is 9. Adding 1 to the greatest one-digit number will result in  9+1 =10. That is, it results in the smallest two-digit number.
 
The greatest two-digit number is 99. Adding 1 to the greatest two-digit number will result in 99+1 =100. That is, it results in the smallest three-digit number.
 
Proceeding in this way, we can have the following table.
 
Greatest numberAdding 1Smallest number
9+1=10
99+1
=100
999+1=1000
9999+1=10000
99999+1=100000
9999999+1=1000000
9999999+1=10000000
 
Thus, the resultant pattern becomes,
Greatest single(1) digit number + 1 = smallest 2-digit number
Greatest 2-digit number + 1 = smallest 3-digit number
Greatest 3-digit number + 1 = smallest 4-digit number
and so on.
Important!
Recall the following:
1 tens = 10 ones
10 tens = 1 hundreds = 100 ones
1 thousand = 10 hundreds = 100 tens
1 lakh = 100 thousands = 1000 hundreds
1 crore = 100 lakhs = 10,000 thousands