The hundred that's nearest to 45 is zero.
45 is only 45 away from that one.
The next one ... 100 ... is 55 away.
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To round 97 to the nearest 100, you need to look at the digit in the tens place, which is 9 in this case. Since 9 is greater than or equal to 5, you will round up. Therefore, 97 rounded to the nearest 100 is 100.
96 round to the nearest ten=100