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if the last two digits are lesser than 50 (e.g. 8634), you round down by making the last two digits 0 (in this case, 8600).If the last two digits are greater than 50 (e.g. 8662), you round up by adding 1 to the hundreds and making the last two digits 0 (in this case, 8700).If the last two digits are exactly 50, you can round up or down, your choice.
Exactly as in the question.
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.
900