9999 - 999 = 9000 - I presume that is what you actually mean?
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You can crack a 3-digit combination lock by sequentially trying every possible number. Writing down and keeping track of every number used will help avoid confusion and speed up results.
Every six-digit number is greater than any five-digit number.
every number from 0000 to 9999
Every square of a 4 digit number has more than four digits.
You multiply the one digit number on the bottom to every number on the top starting at the right and so on with every other number on the bottom.