If your decimal answer is too long, what should you do?

• A. Round to the nearest tenth.
• B. Truncate it or round at the fourth digit.
• C. Keep all digits.
• D. Convert to a fraction.

Answer: (B)

When a decimal goes on longer than is needed, you present the result with a fixed, reasonable level of precision. A common standard is to keep four digits after the decimal. You can either truncate after that point, or round at that point depending on the next digit. If the fifth digit is 5 or higher, you round the fourth digit up; otherwise you leave it as is. This keeps the answer readable and honest about its precision, rather than implying exactness that the data don’t support. Keeping all digits isn’t necessary, and converting to a fraction changes the form rather than addressing the length of the decimal.