Estimating a Decimal Sum or Difference Online Quiz



Following quiz provides Multiple Choice Questions (MCQs) related to Estimating a Decimal Sum or Difference. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - Estimate the sum after rounding each number to the nearest hundredth

59.265 + 63.284 − 32.469 – 15.273

A - 74.82

B - 74.81

C - 75.81

D - 74.71

Answer : B

Explanation

Step 1:

The estimated sum after rounding each number to the nearest hundredth is

59.265 + 63.284 − 32.469 – 15.273 =

59.27 + 63.28 – 32.47 – 15.27 =

Step 2:

122.55 – 47.74 = 74.81

Q 2 - Estimate the sum after rounding each number to the nearest tenth

83.06 + 23.37 − 18.76 – 16.53

A - 71.1

B - 72.2

C - 71.2

D - 71.3

Answer : C

Explanation

Step 1:

The estimated sum after rounding each number to the nearest tenth is

83.06 + 23.37 −18.76 – 16.53 =

83.1 + 23.4 – 18.8 – 16.5 =

Step 2:

106.5 – 35.3 = 71.2

Q 3 - Estimate the sum after rounding each number to the nearest tenth

86.74 + 43.67 − 28.63 – 18.81

A - 82.8

B - 82.9

C - 83.1

D - 83.0

Answer : D

Explanation

Step 1:

The estimated sum after rounding each number to the nearest tenth is

86.74 + 43.67 − 28.63 – 18.81 =

86.7 + 43.7 – 28.6 – 18.8 =

Step 2:

130.4 – 47.4 = 83.0

Q 4 - Estimate the sum after rounding each number to the nearest hundredth

63.123 + 53.468 − 29.837 – 12.541

A - 74.21

B - 74.22

C - 75.21

D - 74.11

Answer : A

Explanation

Step 1:

The estimated sum after rounding each number to the nearest hundredth is

63.123 + 53.468 − 29.837 – 12.541 =

63.12 + 53.47 – 29.84 – 12.54 =

Step 2:

116.59 – 42.38 = 74.21

Q 5 - Estimate the sum after rounding each number to the nearest tenth

58.07 + 23.45 − 18.73 – 15.64

A - 46.3

B - 45.3

C - 47.3

D - 47.4

Answer : C

Explanation

Step 1:

The estimated sum after rounding each number to the nearest tenth is

58.07 + 23.45 − 18.73 – 15.64 =

58.1 + 23.5 – 18.7 – 15.6 =

Step 2:

81.6 – 34.3 = 47.3

Q 6 - Estimate the sum after rounding each number to the nearest tenth

43.03 + 12.48 − 8.52 – 14.29

A - 32.8

B - 33.7

C - 32.6

D - 32.7

Answer : D

Explanation

Step 1:

The estimated sum after rounding each number to the nearest tenth is

43.03 + 12.48 − 8.52 – 14.29 =

43.0 + 12.5 – 8.5 – 14.3 =

Step 2:

55.5 – 22.8 = 32.7

Q 7 - Estimate the sum after rounding each number to the nearest tenth

37.51 + 43.71 − 18.60 – 13.68

A - 49.9

B - 48.9

C - 48.7

D - 48.8

Answer : B

Explanation

Step 1:

The estimated sum after rounding each number to the nearest tenth is

37.51 + 43.71 − 18.60 – 13.68 =

37.5 + 43.7 – 18.6 – 13.7 =

Step 2:

81.2 – 32.3 = 48.9

Q 8 - Estimate the sum after rounding each number to the nearest tenth

78.94 + 67.41 − 28.78 – 13.62

A - 113.9

B - 104.9

C - 103.9

D - 103.8

Answer : C

Explanation

Step 1:

The estimated sum after rounding each number to the nearest tenth is

78.94 + 67.41 − 28.78 – 13.62 =

78.9 + 67.4 – 28.8 – 13.6 =

Step 2:

146.3 – 42.4 = 103.9

Q 9 - Estimate the sum after rounding each number to the nearest hundredth

67.097 + 34.593 − 27.465 – 44.763

A - 29.46

B - 29.45

C - 28.46

D - 29.56

Answer : A

Explanation

Step 1:

The estimated sum after rounding each number to the nearest hundredth is

67.097 + 34.593 − 27.465 – 44.763 =

67.10 + 34.59 – 27.47 – 44.76 =

Step 2:

101.69 – 72.23 = 29.46

Q 10 - Estimate the sum after rounding each number to the nearest tenth

87.85 + 43.31 − 17.90 – 24.14

A - 89.4

B - 89.2

C - 88.2

D - 89.3

Answer : B

Explanation

Step 1:

The estimated sum after rounding each number to the nearest tenth is

87.85 + 43.31 − 17.90 – 24.14 =

87.9 + 43.3 – 17.9 – 24.1 =

Step 2:

131.2 – 42.0 = 89.2


estimating_decimal_sum_or_difference.htm

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