81
The first digit can be any one of 3 (1, 2 or 4),
The second digit can be any one of 3,
The third digit can be any one of 3,
The fourth digit can be any one of 3.
So, in all, 3*3*3*3 = 81
This includes 4 digit numbers that do not include all the three given digits, eg 1111.
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22 x 31 = 124
656 feet is .124 miles, using the international mile of 5280 feet.
124 pounds = 56.245kg
Assuming the digits are not repeated, there are four combinations:123, 124, 134 and 234.
124/2 = 62/2 = 31/31 = 1 2 x 2 x 31 = 124