what is 10.90871211 rounded to the nearest tenth

10.9 To round a number to the nearest tenth, you need to look at the digit in the hundredth place (the second digit after the decimal point).

In this case, the number 10.90871211 has a 0 in the hundredth place. Since the digit after it is less than 5 (which is 8 in this case), we leave the digit in the tenth place (the first digit after the decimal point) as it is, and drop all the digits after it.

Therefore, when rounded to the nearest tenth, 10.90871211 becomes 10.9.