Nothing special about it.
489
+65
554
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Any number when doubled becomes even. Thus the key part of the question is identifying a 3 digit even number that you can add 2 to to become a 4 digit number. The answer is 998. Thus to find the original number we need to do 998/2. This calculates to 499.
-1
2,5 or 8
There are 90 different answers. If A is any 2-digit number (from 10 to 99), then B = 473 + A is a 3-digit number and B - A = 473
A three digit number is a number that has 3 digits. Example 382 3 is the hundred digit. 8 is the tens digit. 2 is the ones digit.