Multiple choice general knowledge math & puzzles Odd Man Out Centimetre Metre Kilogram Ampere Reveal answer Fill a bubble to check yourself A Correct answer Explanation Metre, Kilogram, and Ampere are all base SI units. Centimetre is the odd one out because it's a derived unit (1/100 of a metre), not a base unit. The question tests understanding of fundamental versus derived units in the metric system.