8. Measurement

Lesson

Do you know what a length is? It is a measure of how big something is. 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.

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

Worked Solution

Idea summary

When measuring an object using a ruler, if the start of the object is at a number larger than zero, subtract the starting point from where the object ends on the ruler.

Choose the best estimate for the length of a train carriage.

A

20 metres

B

100 metres

Worked Solution

Idea summary

1cm (centimetre) is about as big as your thumbnail.

1m (metre) is about as long as two normal steps (for an average Year 4 student).