999.99 rounded to the nearest tenth

9 is in the tenths place and 9 is in the hundredths place
Since the digit in the hundredths place (9) is greater than or equal to 5, add 1 to the digit in the tenths place (9)
1 + 9 = 10, so the digit in the tenths place becomes 0, and 1 is added to the digit in the ones place (9)
1 + 9 = 10, so the digit in the ones place becomes 0, and 1 is added to the digit in the tens place (9)
1 + 9 = 10, so the digit in the tens place becomes 0, and 1 is added to the digit in the hundreds place (9)
1 + 9 = 10, so the digit in the hundreds place becomes 0, and 1 is added to the digit in the thousands place (0)
1 + 0 = 1, so the digit in the thousands place becomes 1
The digits to the right of the tenths place are dropped

999.99 rounded to the nearest tenth (one decimal place) = 1,000.0

The solution above and all other related solutions were provided by the Round to the Nearest Tenth Application.