The number has 4 digits. The thousands digit is the number of days in a week. The ones digit is half of 12. The tens digit is the number of wheels on a bicycle. The hundreds digit is 2 less than the ones digit.

6x6

The number has 4 digits. The ones digit is an odd number less than 3. The tens digit is the same as 5+3. The hundreds digit is a multiple of 3 less than 6. The thousands digit is the first number you would dial when calling an ambulance

The number has 3 digits. The ones digit is 82 less than 91. The hundreds digit is an odd number which is bigger then 1 but smaller than 4. The tens digit is the same as 6+3.

6x9

The number has 4 digits. The tens digit is the same as 8-8. The thousands digit is seven more than the tens digit. The ones digit is the number of sides of a square. The hundreds digit is the same as the tens.

The number has 3 digits. The ones digit is an odd number bigger than 7. The tens digit is 5 less than 6. The hundreds digit is the same as the tens.

The number has 3 digits. The tens digit is less than 1. The ones digit is the number of sides of a triangle. The hundreds digit is the same as 10-3.

7x7

3x3+12

4x4-8

The number has 3 digits. The ones digit is double four. The hundreds digit is an even number bigger than 5 but smaller than 7. The tens digit is half the ones digit.

The number has 4 digits. The hundreds digit is the number of sides of a pentagon. The thousands digit is the same as 20/5. The tens digit is more than 0 but less than 2. The ones digit is the same as 20-17.