Step 1: Identify the digit in the place you are rounding to. 1 decimal place means the tenths place — that is the FIRST digit after the decimal point. In 14.378 the tenths digit is 3. Step 2: Look at the very NEXT digit (the hundredths digit) to decide what to do. The hundredths digit is 7. Step 3: Apply the rounding rule: If that digit is 5, 6, 7, 8 or 9 → round UP (add 1 to the tenths digit). If it is 0, 1, 2, 3 or 4 → round DOWN (keep the tenths digit the same). Here 7 ≥ 5, so round up: 3 becomes 4. Step 4: Drop everything after the tenths place. 14.378 → 14.4. Final answer: 14.4 s. Answer: 14.4 s