When rounding to a specific place, take a look at the digit immediately to the right of the target, in this case, the tens place. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.
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It is 450.
372 rounded to the nearest hundred is 400
When rounding 402 to the nearest tens, you look at the digit in the tens place, which is 0. Since 0 is less than 5, the digit remains the same, so 402 rounded to the nearest tens is 400. When rounding to the nearest hundreds, you look at the digit in the hundreds place, which is 4. Since 4 is less than 5, the hundreds digit remains the same, so 402 rounded to the nearest hundreds is 400.
4198 to the nearest 100 = 4200
The answer is zero.