To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the ones and tens places respectively. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
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because 199 rounded to the nearest 10 is 200, so 199 to the nearest 100 is 200.. Because 200 is both a multiple of 10 and 100.
And the following numbers would be...
Infinitely many, since between any two numbers, there are always additional numbers. The exact range of numbers that can be rounded to 3000 depend on how you are rounding - specifically, if you are rounding to the nearest integer, the nearest 10, the nearest 100, or the nearest 1000.
96 round to the nearest ten=100
5000