Concept:Addition of decimals followed by rounding to one decimal place.Explanation:First, add the three numbers.124.3+0.275+74.06=198.635Now, round 198.635 to one decimal place.Look at the digit in the hundredths place, which is 3.Since 3<5, the digit in the tenths place stays as 6.Therefore, 198.635 rounded to one decimal place is 198.6.
