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- An understanding of place value is required.
Skill isolation: rounding to the nearest \(x\)
This applet allows you to generate questions on rounding, and to reveal step-by-step solutions using the slider. The steps involved are:
- Finding relevant consecutive multiples.
- Finding the midpoint of the consecutive multiples.
- Identifying where a number lies on a given section of the number line.
- Deciding what a given number rounds to.
Each of these skills can be practised in isolation by dragging the slider to the appropriate level and then clicking on one of the bullet points towards the top-right to generate another question isolating the same skill.
Part 1 – Rounding to a given place
Click slide to play video
Teachers: log in to access the following:
- Slides in PPTX (with click-to-reveal answers)
- Slides in PDF (one slide per page, suitable for importing into IWB software)
- Worksheet (with space for student work)
- Handout (slides with exercises only; 4 per page for reduced printing)
- Skills drill worksheet (40 questions on one side of A4; answers included)
- Desmos classroom activity: Rounding to a given place value (20 randomised questions) Find out more
Teachers: log in to access these.
Part 2 – Rounding to a given number of significant figures
Teachers: log in to access the following:
- Slides in PPTX (with click-to-reveal answers)
- Slides in PDF (one slide per page, suitable for importing into IWB software)
- Worksheet (with space for student work)
- Handout (slides with exercises only; 4 per page for reduced printing)
- Desmos classroom activity: Rounding to a given number of significant figures (20 randomised questions) Find out more
Teachers: log in to access these.
Part 3 – Truncating decimals
This topic consists only of an examples slide (with embedded video) and a random question generator below.
Click slide to play video
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Cross-curricular link: climate change
This is based on data from https://www.globalwarmingindex.org
- Round the temperature change figure to two decimal places.
- Round the temperature change figure to two significant places.
- Truncate temperature change figure to two decimal places.
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