2500
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When rounding a number to the nearest 100, you look at the digit in the hundreds place. In this case, the hundreds digit is 4. Since the digit in the tens place is 5 or greater, you round up the hundreds digit by adding 1. Therefore, 2451 rounded to the nearest 100 is 2500.
The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".
When rounding 2451 to the nearest hundred then the first figure to be discarded is 5 therefore the previous figure (the one in front of 5 which is 4 is increased by 1)
So 2451 becomes 2500 when rounded to the nearest hundred.
100
0
97 rounded to the nearest hundred is 100. 97 rounded to the nearest ten is 100
2200
0