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GCSE Maths Number Rounding Numbers

Rounding to the Nearest 10, 100 1000

Rounding to the Nearest 10, 100 and 1000

Here we will learn about rounding numbers to the nearest 10, 100, and 1000.
There are also rounding worksheets based on Edexcel, AQA and OCR exam questions, along with further guidance on where to go next if you’re still stuck.

What is rounding to 10, 100 and 1000

Rounding to the nearest 10, 100, and 1000 allows us to approximate the size of a number.

We need to identify the number to the right of the tens, hundreds or thousands column depending on what we are rounding to.
If this number less than 5, round down.
If this number is 5 or more than 5, round up.

E.g.
Round 123 to the nearest 10.

The number to the right of the tens column is 3 which is less than 5 so we round down.
So 123 rounded to the nearest 123 is 120.

E.g.
Round 475 to the nearest 100.

The number to the right of the hundreds column is 7 which is more than 5 so we round up.
So 475 rounded to the nearest 100 is 500.

E.g.
Round 2517 to the nearest 1000.

The number to the right of the thousands column is 5 so we round up.
So 2517 rounded to the nearest 1000 is 3000.

Let’s quickly recap place value by looking at the 4 digit number:

1245

It can be split into 1 thousand, 2 hundreds, 4 tens and 5 ones by placing the digits onto a place value chart.

ThousandsHundredsTensOnesTenths
12450

Using a place value chart can help us to identify the place value of the digits when we are rounding to the nearest 10, 100 and 1000.

What is rounding to 10, 100 and 1000?

What is rounding to 10, 100 and 1000?

How to round numbers to the nearest 10

In order to round to the nearest 10:

  1. Check if the number is a multiple of 10, if it is, do nothing.
  2. If the ones digit is less than 5, round down to the previous 10.
  3. If the ones digit is 5 or more than 5, round up to the next 10.

Rounding to the nearest 10, 100 and 1000 worksheet

Get your free rounding to the nearest 10, 100 and 1000 worksheet of 20+ questions and answers. Includes reasoning and applied questions.

COMING SOON
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Rounding to the nearest 10, 100 and 1000 worksheet

Get your free rounding to the nearest 10, 100 and 1000 worksheet of 20+ questions and answers. Includes reasoning and applied questions.

COMING SOON

Rounding to 10 examples

Example 1: rounding numbers to the nearest 10

Round 23 to the nearest 10.

  1. Check the number is already a multiple of 10, if it is, do nothing.

23 is not a multiple of 10, so we will move on to step 2.

2If the ones digit is less than 5, round down to the previous 10.

The digit to the right of the tens digit is the ones digit which is 3 which is less than 5.
This means that we round down to the previous 10.

This means that the tens digit will stay the same and the ones digit will become 0.

So 23 rounded to the nearest ten is 20.

Example 2: rounding numbers to the nearest 10

Round 67 to the nearest 10.

67 is not a multiple of 10, so we will move on to step 2.

The ones digit (the digit to the right of the tens digit) is 7 which is more than 5.
This means that we round up to the next 10.

We need to add 1 to the tens digit and change the ones digit to zero.
Therefore the 6 will become a 7.

So 67 rounded to the nearest 10 is 70.

How to round numbers to the nearest 100

In order to round to the nearest 100:

  1. Check if the number is a multiple of 100, if it is, do nothing.
  2. If the tens digit is less than 5, round down to the previous 100.
  3. If the tens digit is 5 or more than 5, round up to the next 100.

Rounding to 100 examples

Example 3: rounding numbers to the nearest 100

What is 478 to the nearest 100?

478 is not a multiple of 100, so we will move on to step 2.

The tens digit (the digit to the right of the hundreds digit) is 7 which is more than 5.
This means that we round up to the next 100.

We need to add 1 to the hundreds digit and change the tens and ones digits to zeros. Therefore the 4 will become a 5.

So 478 rounded to the nearest 100 is 500.

Example 4: rounding numbers to thenearest 100

What is 350 rounded to the nearest 100?

350 is a multiple of 10 but not a multiple of 100, so we will move on to step 2. 

The tens digit (the digit to the right of the hundreds digit) is 5.
This means that we round up to the next 100.

We need to add 1 to the hundreds digit and change the tens and ones digits to zeros.
Therefore the 3 will become a 4.

So 350 rounded to the nearest hundred is 400.

How to round numbers to the nearest 1000

In order to round to the nearest 1000:

  1. Check if the number is a multiple of 1000, if it is, do nothing.
  2. If the hundreds digit is less than 5, round down to the previous 1000.
  3. If the hundreds digit is 5 or more than 5, round up to the next 1000.

Rounding to 1000 examples

Example 5: rounding numbers to the nearest 1000

Round 2346 to the nearest 1000.

2346 is not a multiple of 1000, so we will move on to step 2

The hundreds digit (the digit to the right of the thousands digit) is 3 which is less than 5.
This means that we round down to the previous 1000.

This means that the thousands digit will stay the same and the hundreds, tens and ones digits will become zeros.

So 2346 rounded to the nearest 1000 is 2000.

Example 6: word problem

There are 4709 people watching a cricket match. Round this to the nearest thousand.

4709 is not a multiple of 1000 so we can move onto step 2.

The hundreds digit is 7. This is more than 5 so we round up to 5000.

So 4709 rounded to the nearest 1000 is 5000.

Common misconceptions

  • The number 5

Most mistakes occur when dealing with the number 5.
On a number line it is in the middle so it is easier to think you can go in either direction however you must round up.

E.g.

  • 15 rounded to the nearest 10 is 20.
  • 857 rounded to the nearest 100 is 900.
  • 3520 rounded to the nearest 1000 is 4000.

  • Which digit to look at

When rounding to the nearest 10, 100 or 1000 you must identify either the tens, hundreds or thousands digit and then use the digit to the right of it.

E.g. 
Round 2545 to the nearest 100.

With this question we need to look at the tens digit.
In this example the tens digit is 4 so we round down to the previous 100.
2545 rounded to the nearest 100 is 2500.

Practice rounding to the nearest 10, 100 and 1000 questions

1. Round  212.65 to the nearest 10.

210
GCSE Quiz True

10
GCSE Quiz False

200
GCSE Quiz False

212.7
GCSE Quiz False

The ones digit is 2 , which is less than 5 , so we round down to the previous 10 . Therefore the answer is 210 .

There are 563 spectators at a snooker match. Josh states ‘There were approximately 600 people there.’ Phil states ‘There were about 500 people there. Who has correctly rounded to the nearest 100 ?

Phil

GCSE Quiz False

Josh

GCSE Quiz True

Neither of them

GCSE Quiz False

Either could be correct

GCSE Quiz False

The tens digit is 6 , which is greater than 5 , so we round up to the next 100 . The answer is 600 .

3. Round 1236 to the nearest hundred.

1000
GCSE Quiz False

200
GCSE Quiz False

1300
GCSE Quiz False

1200
GCSE Quiz True

The tens digit is 3 , which is less than 5 , so we round down to the previous 100 . The answer is 1200 .

4. During a football match between Manchester United and Watford FC there were 16,543 fans in attendance. What is this number rounded to the nearest thousand?

20,000
GCSE Quiz False

10,000
GCSE Quiz False

16,000
GCSE Quiz False

17,000
GCSE Quiz True

The hundreds digit is 5 so we round up to the next thousand so the answer is 17,000 .

5. The mileage on a car is showing 56,734 miles. What is this number rounded to the nearest thousand?

60,000
GCSE Quiz False

50,000
GCSE Quiz False

57,000
GCSE Quiz True

56,000
GCSE Quiz False

The hundreds digit is 7 , which is greater than 5 , so we round up to the next 1000 . Therefore the answer is 57,000 .

6. A florist sells 60 bouquets rounded to the nearest 10 on Saturday. What is the maximum number of bouquets she could have sold?

60
GCSE Quiz False

69
GCSE Quiz False

64
GCSE Quiz True

55
GCSE Quiz False

The number of bouquets needs to round down to 60 (to the nearest 10 ). We know that numbers with a 5 and above round up and numbers below 5 round down.
The numbers that will round down to 60 are 61, 62, 63 and 64 .
So the biggest number that will round down to 60 is 64 .

Rounding to the nearest 10, 100 and 1000 GCSE questions

1.(a) Write the number thirty thousand, three hundred and seven in figures.
(b) Round this number to the nearest 10 .

(2 marks)

Show answer

a) 30, 307

(1)

b) 30, 310

(1)

2. (a) What is the value of 636,213 rounded to the nearest thousand?
(b) If I instead rounded to the nearest hundred, what would be the difference in my two answers.

(3 marks)

Show answer

a) 636,000

(1)

b) 636,200
(rounding to the nearest hundred)

(1)

636,200  –  636,000 = 200
(correct subtraction)

(1)

3. Tim thinks of a number and rounds it to the nearest 10 . His number is 50 .
(a) What is the smallest possible whole number he could have thought of?
(b) What is the largest possible whole number he could have thought of?

(2 marks)

Show answer

a) 45

(1)

b) 54

(1)

Learning checklist

You have now learned how to:

  • Round numbers to the nearest 10, 100 and 1000.

The next lessons are

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