1. **State the problem:** A carpenter has a piece of wood 8.1 metres long and saws off 6.2 metres from it. 2. **What is asked:** Find the length of the remaining piece of wood. 3. **Formula used:** To find the remaining length, subtract the length sawed off from the original length: $$\text{Remaining length} = \text{Original length} - \text{Length sawed off}$$ 4. **Substitute the values:** $$\text{Remaining length} = 8.1 - 6.2$$ 5. **Calculate:** $$8.1 - 6.2 = 1.9$$ 6. **Answer:** The piece of wood is now 1.9 metres long.