To round 1.866 to the nearest hundredth, follow these steps:
Identify the hundredth place: In the number 1.866, the hundredth place is the second digit after the decimal point, which is 6.
Look at the thousandth place: The digit in the thousandth place (the third digit after the decimal point) is 6.
Apply rounding rules: Since the digit in the thousandth place (6) is greater than or equal to 5, you round the hundredth place up by 1.
Final rounded result: The hundredth place (6) becomes 7, so the number rounds to 1.87
Thus, 1.866 rounded to the nearest hundredth is 1.87