Rounding to three decimal places
Lesson details
Learning outcome
I can round numbers to three decimal places.
Key learning points
- Numbers with any number of decimal places can be represented on a number line.
- Rounding is useful to estimate numbers to a degree of accuracy.
- Numbers can be rounded to 3 decimal places.
- Knowing a number has been rounded means you can give examples of what the unrounded number might have been.
Keywords
Round - To change a number into another number that is approximately the same value but is easier to work with. E.g. round 561 to the nearest 10 is 560.
Common misconception
Errors when a zero is required when rounding. E.g 5.99 rounds to 6 to 1 d.p.
Embedding that 6 and 6.0 may be written like that to convey the accuracy they've been rounded to. To show that 5.99 has been rounded to 1 d.p. we write it as 6.0 not 6.
Teacher tip
As a challenge, encourage pupils to create their own 'what number am I?' problems. They should consider the minimum number of clues needed to ensure there is a unique answer. Use pupils' responses to this as a class task using MWBs to write down an answer as clues are revealed one by one.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is a conjecture?
Q2.Select the numbers that round to 23 000 when rounded to the nearest thousand.
Q3.134 578 is 135 000 to the nearest ...
Q4.Laura estimates how many cars are in a car park. Which of the following is the most appropriate degree of accuracy in this situation?
Q5.A charity is sending thank you cards to 110 people who have made donations. Stamps come in books of 12. How many books of stamps do they need to buy?
Q6.Izzy buys a large bag of 50 chocolate bars. She puts them into boxes of 4 to sell for charity. How many boxes will Izzy have to sell?
Assessment exit quiz
6 Questions
Q1.1.643 is 1.6 to one place.
Q2.The midpoint of 2.2 and 2.3 is .
Q3.The midpoint of 2.268 and 2.269 is .
Q4.Round 14.5682 to 3 decimal places.
Q5.Round 0.0459 to three decimal places.
Q6.Round 172.0998 to three decimal places.
To help you plan your 8 maths lesson on: Rounding to three decimal places, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 8 maths lesson on: Rounding to three decimal places, 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.