Significant Figure - Addition Subtraction

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| By Harry Hwong
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Harry Hwong
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Quizzes Created: 3 | Total Attempts: 7,178
| Attempts: 6,503
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  • 1/6 Questions

    Solve and round accordingly:   63.478 - 52.12

    • 115.598
    • 115.59
    • 115.60
    • 11.36
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About This Quiz

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.

Significant Figure - Addition Subtraction - Quiz

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  • 2. 

    What is the result of the following calculation, rounded to the correct number of significant figures? 25.8 - 13.57 + 6.903

    • 19.1 

    • 19.21 

    • 19.32 

    • 20

    Correct Answer
    A. 19.1 
    Explanation
    In addition and subtraction with significant figures, the final result should be rounded to the least number of decimal places in any of the numbers involved. Here, 25.8 has one decimal place, 13.57 has two, and 6.903 has three. Therefore, the answer should be rounded to one decimal place, giving us 19.1.

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  • 3. 

    Solve and round accordingly:   5.494 - 4.30

    • 1.19

    • 9.79

    • 1.194

    • 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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  • 4. 

    Solve and round accordingly:   4.928 + 37.71 + 5.2543

    • 47.8923

    • 47.9

    • 47.892

    • 47.89

    Correct Answer
    A. 47.89
    Explanation
    The least accurate digit is from 37.71, which has 2 decimal places.

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  • 5. 

    What is the correct answer to the following expression, taking significant figures into account? 12.34 + 0.022 - 1.001

    • 11.45  

    • 11.36 

    • 11. 21

    • 11

    Correct Answer
    A. 11.36 
    Explanation
    When adding or subtracting numbers, the result should be rounded to the least number of decimal places in any of the numbers being used. In this case, 12.34 has two decimal places, 0.022 has three, and 1.001 has three. The least number of decimal places is two, so the answer should be rounded to two decimal places, giving 11.36.

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  • 6. 

    Solve and round accordingly:   8.14 + 6.7550 + 6.504

    • 21.3990

    • 21.399

    • 21.40

    • 21.4

    Correct Answer
    A. 21.40
    Explanation
    First, add the numbers: 8.14 + 6.7550 + 6.504 = 21.399. Then, round to the hundredths place, which is the second digit after the decimal point. The digit in the thousandths place is 9, which is greater than or equal to 5, so we round up the hundredths digit. Therefore, the rounded answer is 21.40.

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  • Current Version
  • Apr 15, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 03, 2017
    Quiz Created by
    Harry Hwong
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