# Adding And Subtracting Significant Figures

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| By Jasondickerson2
J
Jasondickerson2
Community Contributor
Quizzes Created: 2 | Total Attempts: 1,157
Questions: 10 | Attempts: 156

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• 1.

### Subtract: 7.987 m - 0.54 m

• A.

7.447 m

• B.

7.4 m

• C.

7.45 m

• D.

7.5 m

C. 7.45 m
Explanation
The given question asks to subtract 0.54 m from 7.987 m. When subtracting decimals, we align the decimal points and subtract each place value. In this case, subtracting 0.54 from 7.987 gives us 7.447. Rounding this to the nearest hundredth gives us 7.45 m, which is the correct answer.

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• 2.

### Solve: 345.009 g - 23.009 g = ?

• A.

322 g

• B.

322.00 g

• C.

322 g

• D.

322.000 g

D. 322.000 g
Explanation
The given question involves subtracting 23.009 g from 345.009 g. When subtracting decimals, we start from the rightmost place value and subtract each corresponding digit. In this case, subtracting 9 from 9 gives us 0, subtracting 0 from 0 gives us 0, subtracting 0 from 5 gives us 5, subtracting 3 from 3 gives us 0, and subtracting 2 from 4 gives us 2. Therefore, the result of the subtraction is 322.000 g.

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• 3.

### Solve: 3.12 g + 0.8 g + 1.033 g = ??

• A.

5.0 g

• B.

4.953 g

• C.

5 g

• D.

4.9 g

A. 5.0 g
Explanation
The given equation is asking to find the sum of 3.12 g, 0.8 g, and 1.033 g. Adding these values together gives a total of 4.953 g. However, the closest answer choice to this sum is 5.0 g, which is the correct answer.

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• 4.

### Solve 416 - 409.3 = ?

• A.

6.7

• B.

6

• C.

7

• D.

7.0

C. 7
Explanation
The correct answer is 7 because when you subtract 409.3 from 416, you get 6.7. However, since the question asks for the answer without any decimal places, the answer is rounded up to the nearest whole number, which is 7.

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• 5.

### 3.461728 + 14.91 + 0.980001 + 5.2631 = ?

• A.

24.614

• B.

24.61

• C.

24.6

• D.

24.6148

B. 24.61
Explanation
The correct answer is 24.61. This is because when you add 3.461728, 14.91, 0.980001, and 5.2631 together, you get a sum of 24.614. However, the question asks for the answer to be rounded to two decimal places. When you round 24.614 to two decimal places, the digit in the third decimal place (4) is less than 5, so the digit in the second decimal place (1) remains the same. Therefore, the final answer is 24.61.

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• 6.

### 23.1 + 4.77 + 125.39 + 3.581 = ?

• A.

156.8

• B.

157

• C.

156.84

• D.

156.841

A. 156.8
Explanation
The given expression involves adding four numbers: 23.1, 4.77, 125.39, and 3.581. When these numbers are added together, the sum is 156.841. However, since the question asks for the answer to be rounded to one decimal place, the correct answer is 156.8.

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• 7.

### 17.95 + 32.42 + 50 =   ?

• A.

100.37

• B.

100.4

• C.

100.

• D.

100.3

C. 100.
Explanation
The given expression is a simple addition problem. By adding 17.95, 32.42, and 50, we get a sum of 100.37. Therefore, the correct answer is 100.37.

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• 8.

### 74.160 - 4.8 - 0.470 = ?

• A.

68.89

• B.

68.8

• C.

68.9

• D.

69

C. 68.9
Explanation
The given question requires subtracting 4.8 and 0.470 from 74.160. When these values are subtracted, the result is 68.890. However, since the question asks for the answer rounded to one decimal place, the correct answer is 68.9.

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• 9.

### 7000.40 + 6.2 + 6.32 = ?

• A.

7012.9

• B.

7012.92

• C.

7013

• D.

7013.0

A. 7012.9
Explanation
The given equation requires adding three numbers: 7000.40, 6.2, and 6.32. When we add these numbers, we get a sum of 7012.92. However, the answer provided is 7012.9, which suggests that the answer has been rounded down to one decimal place.

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• 10.

### 13.59 + 23.25 - 20 = ?

• A.

16.8

• B.

16

• C.

17

• D.

16.84

C. 17
Explanation
The given expression involves addition, subtraction, and a constant. When we add 13.59 and 23.25, we get 36.84. Subtracting 20 from this sum gives us a final result of 16.84. Therefore, the correct answer is 16.84.

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• Current Version
• May 10, 2024
Quiz Edited by
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• Apr 26, 2017
Quiz Created by
Jasondickerson2

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