How many meters are in 2.5 km?

1 km = 1 000 m, so 2.5 × 1 000 = 2 500 m.

A car travels 180 km in 2 hours 15 minutes. What is its average speed?

2 h 15 min = 2.25 h, and 180 ÷ 2.25 = 80 km/h.

Rounding gives 50 × 20 = 1 000, close to the exact 1 029.

Volume = 1 m³, and 1 m³ = 1 000 L.

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A rectangular room measures 4.5 m by 3.2 m. What is its floor area?