Question

3000 mm is greater or less than or equal to 2 km

Answer 1

1 km = 1,000 m

1 m = 1,000 mm

therefore

1 km = 1,000 m = 1,000 · 1,000 mm = 1,000,000 mm

2 km = 2,000,000 mm > 3,000 mm

Answer: 3,000 mm is less than 2 km.