999.
222
You have to specify the base. For example, in base-16, otherwise known as hexadecimal or hex, the greatest 5 digit number is FFFFF.
It depends on which base system you are using. If you use base 10 (the most common one which is used for most math) then any digit from 0 through 9 is acceptable for any given place value. The largest of these digits would be 9. If you are using a different base system then the answer will be different. For example, in base three the numbers 0 through 2 are acceptable for any one place value. The greatest digit in base three for a place value is 2.
It is 15.
999.
222
The greatest value a digit can have in base for is 3. Thus the largest three-digit number in base for would be 333. In base 10, this number is 3x16 + 3x4 + 3 = 63 Therefore 63 is the largest digit that would be three digits in base 4.
BBB, which is 123-1 = 1728-1 = 1727 in base 10.
You have to specify the base. For example, in base-16, otherwise known as hexadecimal or hex, the greatest 5 digit number is FFFFF.
A three digit number cannot be divisible by a 5 digit number - in any base.
1112 which, in decimal, is 7
The largest 3-digit number in base 3 is 222. Its decimal equivalent is 26
12^3-1=1727
5037 = 248 = 3059
Not in a way that would be generally understood. However, it is possible. An 8-digit number in base 10 can be represented by a 5-digit number in base 32. For example, extending the scheme for labeling digits for base 32, VVVVV32 = 3355443110 Similarly, the 8-digit number 33333333 in base 4 is the 5-digit number 65535 in base 10
666 - which in base 10 would be 294+42+8=344