It is 97, exactly as in the question.
97
97
10
97 rounded to the nearest hundred is 100. 97 rounded to the nearest ten is 100
97
61, 67, 71, 73, 79, 83, 89, 97, so 79 is nearest
101. If you want a prime number less than 100, the closest is 97.
639.497 rounded to the nearest tenth is 639.5. When the tenths digit is less than 5 the number is rounded down. When the tenths digit is 5 or more the number is rounded up. In this case the tenths digit is more than 5, so you round up.
97
100
97 rounded to the nearest hundred is 100. 97 rounded to the nearest ten is 100
97 will have the same result when rounded to the nearest ten or hundred.
97 rounded to the nearest tens place is 100
100
97 rounded to the nearest 10th is 100
97
97
100
Zero
100