1. **Problem statement:** Convert 23 000 kg to tonnes (t). 2. **Formula and rules:** 1 tonne (t) = 1000 kilograms (kg). 3. **Conversion:** $$23\,000\ \text{kg} = \frac{23\,000}{1000}\ \text{t}$$ 4. **Intermediate step with cancellation:** $$= \frac{\cancel{23\,000}}{\cancel{1000}} = 23\ \text{t}$$ 5. **Answer:** 23 000 kg equals 23 tonnes. 1. **Problem statement:** Convert 2.5 km to meters (m). 2. **Formula and rules:** 1 kilometer (km) = 1000 meters (m). 3. **Conversion:** $$2.5\ \text{km} = 2.5 \times 1000\ \text{m}$$ 4. **Calculation:** $$= 2500\ \text{m}$$ 5. **Answer:** 2.5 km equals 2500 meters.