Converting and Calculating Units of Length

1 metre equals 100 centimetres. Since $2\times 100=200$, we get 2 m $=200$ cm.

1 kilometre equals 1000 metres. Since $3.6\times 1000=3600$, we get 3.6 km $=3600$ m.

1 metre equals 1000 millimetres. Since $2.5\times 1000=2500$, we get 2.5 m $=2500$ mm, meaning they are equal.

Convert 250 cm to metres: $250÷100=2.5$ metres. Subtract: $5.5-2.5=3$ metres.

Convert 150 cm to metres: $150÷100=1.5$ metres. Add: $2.5+1.5=4$ metres.

First convert kilometres to metres: $0.085\times 1000=85$ m. Then convert metres to centimetres: $85\times 100=8500$ cm.