23
4 digits
There are 4 digits in 1024
It is: 100,000,000,000,000
With 4 digits you can have 24 = 16 combinations. 1 combination with 0 digits; 4 combinations with 1 digit: 1, 2, 4 and 8 6 combinations with 2 digits: 12, 14, 18, 24, 28 and 48 4 combinations with 3 digits: 124, 128, 148 and 248 1 combination with all 4 digits. In a combination the order of digits is not relevant so that 124 is the same as 142.
4.1
It is 50,00,000.
4/100 or 0.04
It is 1,50,000.
6,00,000
17,00,000
7500000
6,70,000
940
The smallest that I can write is 4/89 = 4/134217728.I am guessing, though, that the answer that you want is 4/98.
175,000
4 72/100 or 4.72