The difference between the greatest and the least four digit numbers that begins with 3 and ends with 5 is:
The greatest four digit number that begins with 3 and ends with 5 = 3995
The least four digit number that begins with 3 and ends with 5 = 3005
$$\therefore\ $$The difference between the greatest and the least four digit numbers that begins with 3 and ends with 5 = 3995 - 3005 = 990
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