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The hundreds' digit (Posted on 2016-02-22) Difficulty: 2 of 5
For the four-digit number ABCD (a string, not a product), where A,B,C, and D all represent distinct digits, find the value of B, given ABCD rounded to the nearest hundred is CD00.

See The Solution Submitted by Ady TZIDON    
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Solution D1? (spoiler) Comment 1 of 1
4950, 5960, 6970 and 7980 all work.  So B must be 9.  But actually, all we need to know is that A changes when rounding to the nearest hundred, so the number must be rounded up, and the only time A changes when B changes is when B is 9.

Edited on February 22, 2016, 8:37 am
  Posted by Steve Herman on 2016-02-22 08:32:04

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