Multiple choice The ratio of 5m to 10km is 2000 : 1 1 : 2000 1 : 2 None of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation Convert units to be the same: 10 km = 10,000 m. The ratio is 5 : 10,000. Dividing both by 5 gives 1 : 2000.