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To round to a place value column, look at the next column to the right: if it is 5 or more round up otherwise round down. To the nearest thousand look at the hundreds column. In this case it is 0, so the number rounds down: 8053 → 8000 to the nearest thousand.
81-0.75 = 0.037 (rounded)
81 rounded to the nearest 10 is 80
0.0186
Rounded to two decimal places, the sixth root of 81 is 2.08.