Topic Four (1.4): Estimating and approximating
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:
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) Links to an external site.
WATCH - Estimating Answers - Multiplication (MathsWatch) Links to an external site.
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.