Securing understanding of rounding
I can recognise when values have been rounded and state sensible suggestions of what the unrounded value could have been.
Securing understanding of rounding
I can recognise when values have been rounded and state sensible suggestions of what the unrounded value could have been.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- When a number has been rounded you can make conjectures about what the unrounded number could have been.
- Rounding can be very useful in real life contexts particularly measure.
- When working in some real life contexts you are often working to a certain degree of accuracy.
- Numbers in different contexts will be rounded to a different degree of accuracy (e.g. distance when walking or flying).
Keywords
Conjecture - A (mathematical) statement that is thought to be true but has not been proved yet.
Degree of accuracy - A degree of accuracy shows how precise a number or measurement is. E.g. to the nearest cm, nearest 10, 1 d.p., etc.
Common misconception
The assumption that if a number ends in 2 zeros it must have been rounded to the nearest hundred.
Choose examples that round to the same value when rounded to the nearest ten and hundred in this case. E.g. 398, rounds to 400 to the nearest ten and 400 to the nearest hundred.
To help you plan your year 8 maths lesson on: Securing understanding of rounding, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 8 maths lesson on: Securing understanding of rounding, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 maths lessons from the Estimation and rounding unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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