86 rounds to 100
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You calculate the percentage and then round the answer to the nearest whole number.
The smallest whole number that rounds off to 90 to the nearest tens is 85. When rounded to the nearest tens, 85 becomes 90. The largest whole number that rounds off to 90 to the nearest tens is 94. When rounded to the nearest tens, 94 also becomes 90.
8.6
1000
Well, isn't that a happy little question! When we round 851 to the nearest 10, we look at the digit in the tens place, which is 5. Since 5 is halfway between 0 and 10, we round up to the nearest 10, which gives us 850.