Round 2.647 to the nearest tenth.

• A. 2.7
• B. 2.65
• C. 2.64
• D. 2.6

Answer: (D)

Rounding to the nearest tenth means using the hundredths digit to decide whether to bump the tenths digit up by one. For 2.647, the tenths digit is 6 and the hundredths digit is 4. Since 4 is less than 5, you keep the tenths digit as 6 and drop the rest, giving 2.6. If the hundredths digit were 5 or more, you’d round up to 2.7. The numbers 2.65 and 2.64 would result from rounding to the nearest hundredth, not the nearest tenth.