# 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.

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

59.265 + 63.284 − 32.469 – 15.273

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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

### 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