New
New
Year 5
Use representations to round a decimal number with tenths to the nearest whole number
I can use representations to round a decimal number with tenths to the nearest whole number.
New
New
Year 5
Use representations to round a decimal number with tenths to the nearest whole number
I can use representations to round a decimal number with tenths to the nearest whole number.
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Lesson details
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.
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.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on
Open Government Licence version 3.0
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Starter quiz
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6 Questions
Q1.
Which descriptions represent this image?
30.2
Q2.
Represent the following picture as a decimal number.
Q3.
Tick the numbers that are multiples of 10.
23
84
Q4.
Tick the missing numbers from the number line.
7.0
7.10
Q5.
Order the numbers in ascending order.
Q6.
Tick the numbers that round to 100 as the nearest multiple of 10.
90
107
Exit quiz
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6 Questions
Q1.
Which of these are not multiples of one?
1
3.0
10
Q2.
Look at the number line. Which two multiples of 1 is a between?
6 and 7
5 and 6
8 and 9
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?
a
b
d
Q4.
7.1 is the number. Tick the pair of numbers that are the previous and next multiples of one.
6 and 8
8 and 9
7 and 7.2
Q5.
What is 8.5 rounded to the nearest multiple of one?
Q6.
What is 17.2 rounded to the nearest multiple of one?