technically you don't line up the ones. you line up the decimals. you do this because it is necessary to compare place value to place value in order to order.
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you subtract by lining your numbers and start from the ones place and continue going to the left
There are 76 such numbers. Eight more if you allow numbers to start with 0.
Any pair of digits (not including 0), can be used to generate 14 four-digit numbers. If one of the digits is 0, only seven will start with a non-zero digit.
The sum is 22 times the sum of the three digits.
Right because you start with the number that begins