10. Measurement

Lesson

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.

Idea summary

Length is a measure of distance between two points.

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.

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

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

A

20 metres

B

100 metres

Worked Solution

Idea summary

When estimating length, 1 cm (centimetre) is about as big as your thumbnail, and 1 m (metre) is about as long as two normal steps (for an average Year 3 student).

measures, records, compares and estimates lengths, distances and perimeters in metres, centimetres and millimetres, and measures, compares and records temperatures