Once! After you have subtracted it once, you are subtracting 100 from 1900, and then 100 from 1800 and on and on
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As many times as you want. If what you mean is, how many times can you subtract 2 from 46 before you hit zero (that is, "how many times does two go into 46") the answer is 23.
Just once. Because the number is now 30 and not 32. So, it is impossible to subtract from it again.
You can only subtract 5 from 25 once because after the first time it is no longer 25 :)
5 because 5 x 5 is 25
5 times