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Rounding Numbers (Year 3/4)
The nearest 100 to 641 is 600.

Rounding Numbers (Year 3/4)

In Year 3 and 4 Maths, rounding helps pupils estimate numbers quickly and understand value by making large or complex figures easier to work with.

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Fascinating Fact:

Rounding makes large numbers easier to understand, like saying there are about eight million people in London.

In KS2 Maths, pupils learn how to round numbers to the nearest ten, hundred, or thousand to make calculations simpler. Rounding is a key skill used in everyday life, such as estimating prices while shopping or measuring distances on a map.

  • Rounding: Changing a number to the nearest ten, hundred, or other place value to make it easier to use.
  • Estimate: An approximate calculation used when an exact number isn’t needed.
  • Place Value: The value of where a digit sits in a number, such as ones, tens, or hundreds.
What does rounding mean in Year 3 Maths?

Rounding means finding the nearest ten or hundred to make a number simpler to use. For example, 47 rounds to 50 and 124 rounds to 100.

Why do we round numbers in Maths?

We round numbers to make them easier to calculate or understand. It helps estimate totals, distances, and measurements quickly without exact figures.

What are the rules for rounding numbers?

If the next digit is 5 or more, round up. If it’s 4 or less, round down. For example, 36 rounds to 40, but 33 rounds to 30.

1 .
Why is rounding 45 more difficult?
It is half way between 40 and 50
It is a multiple of 9
It is an odd number
It is half way between 0 and 50
As 45 is half way between 40 and 50 the rule is to always round 5 up
2 .
Which is the nearest 100 to 379?
100
200
300
400
379 is closer to 400 than to 300
3 .
What is the nearest 100 to 850?
700
800
900
1,000
As the number ends in 50 we always round up to the nearest 100
4 .
Which is the nearest 10 to 87?
80
90
100
200
87 is only 3 less than 90
5 .
Which of these numbers would be rounded down to the nearest 10?
36
25
19
91
25 is rounded up as it ends in a 5
6 .
What is the nearest 100 to 641?
600
700
800
1,000
As 41 is less than 50, 641 is rounded down to 600
7 .
In which of these questions would you need to round the answer up?
A box holds 6 cakes. How many boxes will I need to hold 34 cakes?
Tickets cost £5. I have £22 how many tickets can I buy?
Sweets cost 20p. I have £1. How many sweets can I buy?
A pencil is 10cm. How long will 3 pencils be?
34 ÷ 6 = 5 with 4 left over. As the remaining 4 need to go in a box 6 boxes are needed
8 .
Which is the nearest 10 to 33?
10
20
30
40
33 is closer to 30 than 40
9 .
Which of these numbers would be rounded down to the nearest 100?
134
250
879
191
Just as 5 is rounded up to 10, 50 is rounded up to 100 so 250 would not be rounded down
10 .
Which is the nearest 10 to 75?
70
80
90
100
Remember that 5s are rounded up not down
You can find more about this topic by visiting BBC Bitesize - How to round numbers

Author:  Amanda Swift (Primary School Teacher & Educational Content Developer)

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