To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the tens place. 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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900 When rounding to the nearest hundred, like we did with 850 above, we use the following rules: A) We round the number up to the nearest hundred if the last two digits in the number are 50 or above. B) We round the number down to the nearest hundred if the last two digits in the number are 49 or below. C) If the last two digits are 00, then we do not have to do any rounding, because it is already to the hundred.
555
-12
7649
Yes, it's just like 115 to the nearest hundred is 100. If the last two digits is less than 50 you have to round down. -15 to the nearest hundred is also 0. -95 to the nearest hundred is -100. -115 to the nearest hundred is -100. I'm not sure what -50 to the nearest hundred is, though!