18.6666 rounded to the nearest zero decimal place would be 19
Warning: Writing 19.0 gives 1 decimal place, so make sure you don't do that!
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To round 7.7 to the nearest decimal place, you would look at the digit in the second decimal place, which is 7. Since this digit is 5 or greater, you would round up the digit in the first decimal place by adding 1. Therefore, 7.7 rounded to the nearest decimal place would be 7.8.
The second zero to the right of the decimal point is the hundredths (1/100) place.
Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the 11th decimal place. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the fourth decimal place. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
The third plce value to the right of the decimal point is the thousandths place. So the 3rd zero after the decimal would be called 0 thousandths.