263
1349
4284
1 3 4 9
Look for the first digit that is different. In this case, the first digit after the decimal point. The number that has the larger digit in this position, is larger. If the first digit is the same, compare the second digit with the second digit, the third digit with the third digit, and so forth, until you find a difference.
182
The first and last, and the second and third.
The number 2464 fulfils the requirements.
Write them as decimals, and compare. If the first digit of two numbers is equal, compare the second digit; if the second digit is equal, compare the third digit, etc.
The first digit has 4 choices for its digit. The second digit has 6 choices and the third has 3. The solution would simply be 4*6*3=72 three digit numbers.
1155
1
The first digit can have 5 possible numbers, the second digit can have 4, the third 3, the fourth 2. 5