"To round the decimal number 285.429 to the nearest tenth, we need to look at the digit in the hundredths place, which is 2.
If the digit in the hundredths place is 5 or greater, we round up the digit in the tenths place. If it is less than 5, we leave the digit in the tenths place as it is.
In this case, the digit in the hundredths place is 2, which is less than 5. Therefore, we leave the digit in the tenths place as it is, which is 2.
So, rounding 285.429 to the nearest tenth gives us:
285.4
Therefore, the rounded value of the decimal number 285.429 to the nearest tenth is 285.4." (ChatGPT, 2023)