1,234
The least three-digit number that is divisible by both 5 and 9 is 135.
99,600 is the largest 5-digit number that meets both requirements.
54
54.
99999
How about: 108
2400
27000
Any number whose last digit is 0 would be divisible by both these numbers. 1000, 1010, 1020...
9000 is one such number.
9990 is one such number.
99,996