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Rounding three and four digit numbers

to the nearest 10 and 100

Maths - Place Value

Ms Davis

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Learning Objective

  • To understand how to round three and four digit numbers to the nearest 10 and 100

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Success Criteria:

  • Identify multiples of 10
  • Round three and four digit numbers to the nearest 10
  • Identify multiples of 100
  • Round three and four digit numbers to the nearest 100

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Ruler

4

Worksheet and exercise book or paper

Pencil

Image credit: Pixabay

In this lesson, you will need:

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5

Starter quiz

Recap previous lessons

Rounding to 10

Rounding to 100

Exit quiz

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Keywords

Digit: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

​

Numeral: symbols used to represent numbers

​

Integer: whole numbers (not fractions)

​

Multiple: the product of multiplying that number by an integer

​

Rounding: finding the closest multiple to a given number

​

6

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Why do we need to know about rounding numbers?

7

Organising:

The school has around 800 students.

There are approximately 100 guests.

about

around

approximately

roughly

E

Time:

It’s about 9.30.

I’ll be roughly 20 minutes.

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8

Multiples of 10

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Multiples of ten

9

Credit: Mathsbot

E

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Multiples of ten

Write in the missing multiples of 10

10

Credit: Mathsbot

10

20

30

40

50

80

90

100

110

120

360

370

380

390

400

5630

5640

5650

5660

5670

M

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Multiples of ten - zero ones

11

2

2

2

0

3

4

0

2

0

0

0

1

3

0

0

=

100 = 10 x 10

Credit: Mathsbot

1000 = 100 x 10

E

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Which numbers are multiples of 10?

12

310

77

20

112

5000

2430

2001

566

9990

2340

100

4580

Resume once you’re finished

Pause

CfU

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13

Rounding to the nearest 10

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How do we find the nearest 10?

14

under 5 rounds down

5 and above rounds up

0 1 2 3 4

5 6 7 8 9 10

Credit: Mathsbot

E

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How do we find the nearest 10?

15

under 5 rounds down

5 and above rounds up

120 121 122 123 124

125 126 127 128 129 130

Credit: Mathsbot

M

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Write the numbers that will round down

Write the numbers that will round up

16

under 5 rounds down

5 and above rounds up

1460 1461 1462 1463 1464

1465 1466 1467 1468 1469 1470

Credit: Mathsbot

P

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Rounding to the nearest 10

17

Thousands

1000s

Hundreds

100s

Tens

10s

Ones

1s

5

7

3

8

3

5

4

5

6

1

8

2

5

7

4

0

6

1

8

0

3

5

5

0

5730

5740

6190

6180

3550

3540

M

Credit: Mathsbot

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Round to the nearest 10

18

1730

1740

5380

5370

7830

7820

Thousands

1000s

Hundreds

100s

Tens

10s

Ones

1s

1

7

3

8

7

8

2

3

5

3

7

5

1

7

4

0

5

3

8

0

7

8

2

0

P

Credit: Mathsbot

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19

Multiples of 100

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Multiples of one hundred

100

20

​

​

​

​

​

​

100

200

300

400

500

600

Credit: Mathsbot

E

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Multiples of one hundred

21

3

4

0

0

2

0

0

0

1

3

0

0

13 hundreds

=

1000 = 10 x 100

20 hundreds

2

2

0

0

34 hundreds

22 hundreds

Credit: Mathsbot

E

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Which numbers are multiples of 100?

22

3100

7700

4300

1120

800

2430

2000

100

9000

2340

150

1900

Resume once you’re finished

Pause

CfU

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23

Rounding to the nearest 100

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How do we find the nearest 100?

24

under 50 rounds down

50 and above rounds up

0 - 49

51 - 100

Credit: Mathsbot

E

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How do we find the nearest 100?

25

under 50 rounds down

50 and above rounds up

1200 - 1249

1250 - 1300

Credit: Mathsbot

M

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Write the range of numbers that will round down.

Write the range of numbers that will round up.

26

under 50 rounds down

50 and above rounds up

2500 - 2549

2550 - 2600

Credit: Mathsbot

P

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We don’t round twice!

27

3649

Nearest 10

Nearest 100

​

3600

3650

3700

Credit: Mathsbot

E

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Rounding to the nearest multiple of 100

Thousands

1000s

Hundreds

100s

Tens

10s

Ones

1s

5

7

3

8

28

3

5

4

9

6

1

8

2

5

7

0

0

6

2

0

0

3

5

0

0

5700

5800

6200

6100

3600

3500

M

28

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Round to the nearest 100

29

1700

1800

5400

5300

7900

7800

Thousands

1000s

Hundreds

100s

Tens

10s

Ones

1s

1

7

3

8

7

8

2

3

5

3

7

5

1

7

0

0

5

4

0

0

7

8

0

0

Credit: Mathsbot

P

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Review of lesson

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Learning Objective

  • To understand how to round three and four digit numbers to the nearest 10 and 100

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Success Criteria:

  • Identify multiples of 10
  • Round three and four digit numbers to the nearest 10
  • Identify multiples of 100
  • Round three and four digit numbers to the nearest 100

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Pause the video to complete your task

Resume once you’re finished

Complete the Worksheet

Using the skills you just learned, complete the ‘Rounding three and four digit numbers to the nearest 10 and 100’ worksheet.

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Worksheet Answers

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Fill in the missing numbers on the number line.

​

Rounding to the nearest 10 and 100 - Worksheet 5 - ANSWERS

Numbers rounded down

120

121

122

123

124

Numbers rounded up

125

126

127

128

129

130

The multiples of 10 are

120

130

120 121 122 123 124 125 126 127

130

Credit: Mathsbot

35

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Find the number on the number line. Write its nearest multiple of 10 in the box.

Rounding to the nearest 10 and 100 - Worksheet 6 - ANSWERS

Number

Nearest 10

5625

5630

5621

5620

5629

5630

5627

5630

5626

5630

5620

5620

Number

Nearest 10

5622

5620

5624

5620

5630

5630

5628

5630

5623

5620

Credit: Mathsbot

36

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Rounding to the nearest 10.

Which numbers on the number line would be rounded to 230, 240 or 250?

​

Rounding to the nearest 10 and 100 - Worksheet 7 - ANSWERS

230

231

232

233

234

245

246

247

248

249

250

230

235

236

237

238

239

240

241

242

243

244

240

250

Credit: Mathsbot

37

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Find the number on the number line.

Write its nearest multiple of 100 in the box.

Rounding to the nearest 10 and 100 - Worksheet 8 - ANSWERS

Number

Nearest 100

2010

2000

2051

2100

2089

2100

2035

2000

Number

Nearest 100

2045

2000

2070

2100

2025

2000

2062

2100

Credit: Mathsbot

38

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Round these numbers to the nearest 10 and the nearest 100

Rounding to the nearest 10 and 100 - Worksheet 9 - ANSWERS

Number

Nearest 10

Nearest 100

1251

1250

1300

99

100

100

3675

3680

3700

5510

5510

5500

883

880

900

Credit: Mathsbot

39

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Fill in the missing multiples of 10

​

​

​

Rounding to the nearest 10 and 100 - Worksheet - Support - ANSWERS

40

Credit: Mathsbot

40

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Rounded to the nearest 10 is 3650

Rounded to the nearest 100 is 3700

Rounding to the nearest 10 and 100 - Worksheet - Extension - ANSWERS

3650, 3651, 3652, 3653, 3654

Rounded to the nearest 10 is 1500

Rounded to the nearest 100 is 1500

Rounded to the nearest 10 is 9950

Rounded to the nearest 100 is 9900

1495, 1496, 1497, 1498, 1499

1500, 1501, 1502, 1503, 1504

9945, 9946, 9947, 9948, 9949

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Credit: Mathsbot

What could the number be?

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