Introduction

You are now going to learn about significant figures, and then you will round numbers to one significant figure to help estimate the answer to a calculation.

Working through your course book

Read through the examples on page 10, which show how to round a number to 1sf and then how this is used in estimations.
If you would like more guidance, go to the MyMaths 3B digital book and watch the video on page 11.
Answer the questions on page 11.
If you would like more practice, work through these lessons on the MyMaths website:
- EXPLORE– Significant figures (MyMaths)
- EXPLORE– Estimating Calculations (MyMaths)

You may also want to watch the following MathsWatch videos and work through the interactive questions using the tab at the top of the screen:

WATCH - Rounding - Significant Figures (MathsWatch)

WATCH - Estimating Answers - Multiplication (MathsWatch)

Support activities for this topic

The MyMaths 3A digital book introduces these topics at a slower pace. If you'd like to take more time to understand these, look at pages 126–127 for more support.

Extension activities for this topic

If you would like more of a challenge on this topic, go to page 5 of the MyMaths 3C digital book and attempt questions 5 and 6.