# Three-Digit Numbers: Rounding, Adding and Estimating

In this worksheet, students estimate the answer to an addition by rounding off numbers to the nearest hundred or ten.

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate Calculations and Check Answers

Difficulty level:

### QUESTION 1 of 10

In this worksheet children will learn about estimation by rounding numbers off to the nearest hundred or ten.

Example

Round these numbers off to the nearest hundred so that the answer can be estimated

321 + 689   can be rounded off to
 A
+
 B

A     321 rounds to 300 to the nearest hundred

B     689 rounds to 700 to the nearest hundred

C     300 + 700 = 1000

Round these numbers off to the nearest hundred so that the answer can be estimated

507 + 366   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
500
B
900
C
400

Round these numbers off to the nearest hundred so that the answer can be estimated

211 + 469   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
200
B
700
C
500

Round these numbers off to the nearest hundred so that the answer can be estimated

197 + 666   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
200
B
900
C
700

Round these numbers off to the nearest hundred so that the answer can be estimated

474 + 136   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
500
B
600
C
100

Round these numbers off to the nearest ten so that the answer can be estimated

21 + 82   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
100
B
20
C
80

Round these numbers off to the nearest ten so that the answer can be estimated

30 + 75   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
30
B
110
C
80

Round these numbers off to the nearest hundred so that the answer can be estimated

271 + 449   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
300
B
700
C
400

Round these numbers off to the nearest hundred so that the answer can be estimated

201 + 69   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
300
B
100
C
200

Round these numbers off to the nearest hundred so that the answer can be estimated

651 + 472   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
700
B
500
C
1200

Round these numbers off to the nearest hundred so that the answer can be estimated

288 + 969   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
1300
B
1000
C
300
• Question 1

Round these numbers off to the nearest hundred so that the answer can be estimated

507 + 366   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
500
B
400
C
900
• Question 2

Round these numbers off to the nearest hundred so that the answer can be estimated

211 + 469   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
200
B
500
C
700
• Question 3

Round these numbers off to the nearest hundred so that the answer can be estimated

197 + 666   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
200
B
700
C
900
• Question 4

Round these numbers off to the nearest hundred so that the answer can be estimated

474 + 136   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
500
B
100
C
600
• Question 5

Round these numbers off to the nearest ten so that the answer can be estimated

21 + 82   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
20
B
80
C
100
• Question 6

Round these numbers off to the nearest ten so that the answer can be estimated

30 + 75   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
30
B
80
C
110
• Question 7

Round these numbers off to the nearest hundred so that the answer can be estimated

271 + 449   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
300
B
400
C
700
• Question 8

Round these numbers off to the nearest hundred so that the answer can be estimated

201 + 69   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
200
B
100
C
300
• Question 9

Round these numbers off to the nearest hundred so that the answer can be estimated

651 + 472   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
700
B
500
C
1200
• Question 10

Round these numbers off to the nearest hundred so that the answer can be estimated

288 + 969   can be rounded off to
 A
+
 B

Match the correct values for A, B and C.

## Column B

A
300
B
1000
C
1300
---- OR ----

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