Skill: Estimate length in metres

To estimate a length in metres, compare the object with something that is about 1 metre long, such as a metre stick or the distance from one hand to the other when your arms are stretched out.

Example: Estimate the length of a classroom rug.

1. Look at the rug from one end to the other.

2. Imagine placing a $1$-metre stick along its length.

3. The rug looks about as long as 3 metre sticks.

4. So, the estimated length is

$$\text{length} \approx 3\text{ metres}$$

5. Check your estimate: the rug is longer than $1$ metre and $2$ metres, but not as long as $4$ metres. So, $3$ metres is reasonable.

An estimate is a close guess, not an exact measurement.