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In this worksheet, students must estimate the answer to addition sums by rounding two numbers to the nearest ten and then adding. Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:   ### 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

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

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

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

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

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

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

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

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

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

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

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

170
EDDIE SAYS

87 + 78

↓      ↓

90 + 80 = 170

---- OR ----

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