10.01 Measure and estimate lengths

Do you know what a length is? It is a measure of distance between two points, such as the two ends of an object. This lesson we will look at measuring some lengths and making estimates on lengths.

This video looks at how to measure objects including making sure that the measurement tool is lined up to start at zero.

Examples

Example 1

What is the length of the line shown in the image?

Worked Solution

Create a strategy

Subtract the number at the starting point from the point where the bar ends.

Apply the idea

Starting at 15, we can see that the coloured bar ends at 18 centimetres.

\displaystyle \text{Length}	\displaystyle =	\displaystyle 18-15	Subtract 15 from 18
	\displaystyle =	\displaystyle 3 \text{ cm}	Evaluate

Watch question walkthrough

This video shows us how we can estimate the length of an object, using items we know.

Examples