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Estimating Additions (1)

In this worksheet, students must estimate the answer to addition sums by rounding two numbers to the nearest ten and then adding.

'Estimating Additions (1)' worksheet

Key stage:  KS 2

Curriculum topic:  Number: Addition and Subtraction

Curriculum subtopic:  Estimate and Check Answers

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

We can estimate the answer to an addition sum by rounding the numbers to the nearest ten before we add.

 

Example 1

Estimate the answer to the following sum by rounding the numbers to the nearest ten and then adding.

 

26 + 47

 

Answer

26 + 47

 ↓      ↓

30 + 50 = 80

 

Example 2

Estimate the answer to the following sum by rounding the numbers to the nearest ten and then adding.

 

94 + 75

 

Answer

94 + 75

 ↓      ↓

90 + 80 = 170

 

Remember that 75 rounds up to 80, 35 rounds up to 40, 25 round up to 30 etc. 

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

16 + 27

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

33 + 26

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

44 + 46

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

28 + 53

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

18 + 75

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

39 + 62

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

57 + 72

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

15 + 96

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

57 + 58

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

87 + 78

  • Question 1

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

16 + 27

CORRECT ANSWER
50
EDDIE SAYS

16 + 27

 ↓      ↓

20 + 30 = 50

  • Question 2

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

33 + 26

CORRECT ANSWER
60
EDDIE SAYS

33 + 26

 ↓      ↓

30 + 30 = 60

  • Question 3

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

44 + 46

CORRECT ANSWER
90
EDDIE SAYS

44 + 46

 ↓      ↓

40 + 50 = 90

  • Question 4

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

28 + 53

CORRECT ANSWER
80
EDDIE SAYS

28 + 53

 ↓      ↓

30 + 50 = 80

  • Question 5

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

18 + 75

CORRECT ANSWER
100
EDDIE SAYS

18 + 75

 ↓      ↓

20 + 80 = 100

  • Question 6

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

39 + 62

CORRECT ANSWER
100
EDDIE SAYS

39 + 62

 ↓      ↓

40 + 60 = 100

  • Question 7

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

57 + 72

CORRECT ANSWER
130
EDDIE SAYS

57 + 72

 ↓      ↓

60 + 70 = 130

  • Question 8

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

15 + 96

CORRECT ANSWER
120
EDDIE SAYS

15 + 96

 ↓      ↓

20 + 100 = 120

  • Question 9

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

57 + 58

CORRECT ANSWER
120
EDDIE SAYS

57 + 58

 ↓      ↓

60 + 60 = 120

  • Question 10

Estimate the answer by rounding the numbers to the nearest ten and then adding.

 

87 + 78

CORRECT ANSWER
170
EDDIE SAYS

87 + 78

 ↓      ↓

90 + 80 = 170

---- OR ----

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