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Round and Add Numbers

In this worksheet, students learn to round numbers to the nearest hundred in order to estimate the answer to an addition.

'Round and Add Numbers' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Number and Place Value

Curriculum subtopic:   Round Numbers Up/Down (to 10, 100 or 1000)

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

In this worksheet you will learn to round numbers to the nearest hundred to estimate the answer to an addition.

 

Example

Estimate the answer to the addition by first rounding both numbers to the nearest hundred.

Remember when rounding to the nearest hundred, look at the tens place. If the number in the tens place is less than 5, round down! If the number in the tens place is 5 or more, round up!

543 + 781

A

 + 

B

 = 

C

 

Answer

543 rounds to 500.

781 rounds to 800.

When we add 500 + 800 = 1300

543 + 781

500

 + 

800

 = 

1300

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

304 + 893
A
 + 
B
 = 
C

Column A

Column B

A
900
B
1200
C
300

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

174 + 775
A
 + 
B
 = 
C

Column A

Column B

A
1000
B
200
C
800

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

304 + 803
A
 + 
B
 = 
C

Column A

Column B

A
1100
B
800
C
300

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

914 + 293
A
 + 
B
 = 
C

Column A

Column B

A
300
B
1200
C
900

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

978 + 433
A
 + 
B
 = 
C

Column A

Column B

A
1000
B
1400
C
400

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

192 + 723
A
 + 
B
 = 
C

Column A

Column B

A
700
B
200
C
900

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

305 + 603
A
 + 
B
 = 
C

Column A

Column B

A
300
B
900
C
600

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

944 + 136
A
 + 
B
 = 
C

Column A

Column B

A
900
B
100
C
1000

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

834 + 676
A
 + 
B
 = 
C

Column A

Column B

A
800
B
700
C
1500

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

499 + 150
A
 + 
B
 = 
C

Column A

Column B

A
200
B
500
C
700
  • Question 1

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

304 + 893
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
300
B
900
C
1200
EDDIE SAYS
304 - The 0 in the tens place is less than 50, so round down to 300. 893 - The 90 in the tens place is more than 50, so round up to 900. 300 + 900 = 1200.
  • Question 2

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

174 + 775
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
200
B
800
C
1000
EDDIE SAYS
174 - The 70 in the tens place is more than 50, so round up to 200. 775 - The 70 in the tens place is more than 50, so round up to 800. 200 + 800 = 1000.
  • Question 3

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

304 + 803
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
300
B
800
C
1100
EDDIE SAYS
304 - The 0 in the tens place is less than 50, so round down to 300. 803 - The 0 in the tens place is less than 50, so round down to 800. 300 + 800 = 1100.
  • Question 4

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

914 + 293
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
900
B
300
C
1200
EDDIE SAYS
914 - The 10 in the tens place is less than 50, so round down to 900. 293 - The 90 in the tens place is more than 50, so round up to 300. 900 + 300 = 1200.
  • Question 5

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

978 + 433
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
1000
B
400
C
1400
EDDIE SAYS
978 - The 70 in the tens place is more than 50, so round up to 1000. 433 - The 30 in the tens place is less than 50, so round down to 400. 1000 + 400 = 1400.
  • Question 6

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

192 + 723
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
200
B
700
C
900
EDDIE SAYS
192 - The 90 in the tens place is more than 50, so round up to 200. 723 - The 20 in the tens place is less than 50, so round down to 700. 200 + 700 = 900.
  • Question 7

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

305 + 603
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
300
B
600
C
900
EDDIE SAYS
305 - The 0 in the tens place is less than 50, so round down to 300. 603 - The 0 in the tens place is less than 50, so round down to 600. 300 + 600 = 900.
  • Question 8

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

944 + 136
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
900
B
100
C
1000
EDDIE SAYS
944 - The 40 in the tens place is less than 50, so round down to 900. 136 - The 30 in the tens place is less than 50, so round down to 100. 900 + 100 = 1000.
  • Question 9

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

834 + 676
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
800
B
700
C
1500
EDDIE SAYS
834 - The 30 in the tens place is less than 50, so round down to 800. 676 - The 70 in the tens place is more than 50, so round up to 700. 800 + 700 = 1500.
  • Question 10

Estimate the answer by rounding the numbers to the nearest 100 before adding to find C.

499 + 150
A
 + 
B
 = 
C
CORRECT ANSWER

Column A

Column B

A
500
B
200
C
700
EDDIE SAYS
499 - The 90 in the tens place is more than 50, so round up to 500. 150 - There is a 50 in the tens place, so round up to 200. 500 + 200 = 700.
---- OR ----

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