Significant Figure - Addition Subtraction

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| Written by Harry Hwong

Harry Hwong

Community Contributor

Quizzes Created: 3 | Total Attempts: 4,221

Questions: 6 | Attempts: 3,701 | Updated: Mar 22, 2023

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Created By: Mr. Hwong™ of Arroyo High School, El Monte, CA
Free Chemistry education to all students: hwongclassroom. Com
Report any errors to me: harry. Hwong@emuhsd. Org
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Significant Figure - Addition Subtraction Rule: Round answers to the least accurate digit.

Questions and Answers

1.

Solve and round accordingly: 4.928 + 37.71 + 5.2543
- A.
  
  47.8923
- B.
  
  47.9
- C.
  
  47.892
- D.
  
  47.89
Correct Answer
D. 47.89

Explanation
The least accurate digit is from 37.71, which has 2 decimal places.

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4
0
2.

Solve and round accordingly: 8.14 + 6.7550 + 6.504
- A.
  
  21.3990
- B.
  
  21.399
- C.
  
  21.40
- D.
  
  21.4
Correct Answer
C. 21.40

Explanation
The least accurate digit is from 8.14, which has 2 decimal places. The last zero is required to maintain 2 decimal places.

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3
0
3.

Solve and round accordingly: 5.91 - 7.4
- A.
  
  13.31
- B.
  
  13.3
- C.
  
  -1.49
- D.
  
  -1.5
Correct Answer
D. -1.5

Explanation
The least accurate digit is from 7.4, which has 1 decimal places. This is a subtraction problem and has led to a negative answer.

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2
0
4.

Solve and round accordingly: 5.494 - 4.30
- A.
  
  1.19
- B.
  
  9.79
- C.
  
  1.194
- D.
  
  1.2
Correct Answer
A. 1.19

Explanation
The least accurate digit is from 4.30, which has 2 decimal places.

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2
0
5.

Solve and round accordingly: 7.1615 + 44.8200
- A.
  
  51.9815
- B.
  
  51.981
- C.
  
  51.98
- D.
  
  52.0
Correct Answer
A. 51.9815

Explanation
The least accurate digit is from both numbers, which has 4 decimal places.

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2
0
6.

Solve and round accordingly: 63.478 - 52.12
- A.
  
  115.598
- B.
  
  115.59
- C.
  
  115.60
- D.
  
  11.36
Correct Answer
D. 11.36

Explanation
The least accurate digit is from 52.12, which has 2 decimal places.

Rate this question:

2
0

Significant Figure - Addition Subtraction

Solve and round accordingly: 4.928 + 37.71 + 5.2543

Solve and round accordingly: 8.14 + 6.7550 + 6.504

Solve and round accordingly: 5.91 - 7.4

Solve and round accordingly: 5.494 - 4.30

Solve and round accordingly: 7.1615 + 44.8200

Solve and round accordingly: 63.478 - 52.12