Use representations to round a decimal number with tenths to the nearest whole number
Lesson details
Learning outcome
I can use representations to round a decimal number with tenths to the nearest whole number.
Key learning points
- Identify the next and previous whole numbers to the number being rounded.
- Identify which whole number is nearest to the number being rounded.
- If the value of the tenths is 5 or greater then round to the next whole number.
- If the value of the tenths is less than 5, round to the previous whole number.
Keywords
Multiple - A multiple is the result of multiplying a number by an integer. For example 2 × 5 = 10 so 10 is a multiple of 2 and 5.
Next - Something that comes after something else.
Previous - Something that comes before something else.
Rounding - Rounding means making a number simpler but keeping its value close to what it was.
Common misconception
Pupils say the previous multiple of one as a whole before e.g. previous multiple of 3.4 as 2 or 2.4
Place the number on a number line and clarify the whole numbers it sits between.
Teacher tip
Be sure to encourage pupils to reason about the position of each number and how far away it is from either multiple of one or the midpoint. Support pupils to learn the generalisation by heart once they have noticed it for themselves.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which descriptions represent this image?
Q2.Represent the following picture as a decimal number.
Q3.Tick the numbers that are multiples of 10.
Q4.Tick the missing numbers from the number line.
Q5.Order the numbers in ascending order.
Q6.Tick the numbers that round to 100 as the nearest multiple of 10.
Assessment exit quiz
6 Questions
Q1.Which of these are not multiples of one?
Q2.Look at the number line. Which two multiples of 1 is a between?
Q3.5 is the previous multiple of 1 and 6 is the next multiple of 1. Which letter on the number line could this statement refer to?
Q4.7.1 is the number. Tick the pair of numbers that are the previous and next multiples of one.
Q5.What is 8.5 rounded to the nearest multiple of one?
Q6.What is 17.2 rounded to the nearest multiple of one?
To help you plan your 5 maths lesson on: Use representations to round a decimal number with tenths to the nearest whole number, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 5 maths lesson on: Use representations to round a decimal number with tenths to the nearest whole number, 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 2 maths lessons from the Compose and calculate with decimals including column addition and subtraction unit, dive into the full primary maths curriculum, or learn more about lesson planning.