When rounding in the hundreds, you round when the tenths digit is greater than or equal to 5. In this case, 7 isgreater than 5, so you will round the ones digit up to the next- the answer is 400.
(400)
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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
989.5 to the nearest 100 is 1000.