Significant Figures (addition)
Mediumphysics
Compute (12.31 + 0.4 + 3.027) applying significant figure addition rule.
Select the correct option:
Solution
Incorrect! Answer:
15.7
- Addition/Subtraction Rule: The result should be rounded to the same number of decimal places as the measurement with the fewest decimal places.
- Analyze Terms:
- 12.31 has 2 decimal places.
- 0.4 has 1 decimal place.
- 3.027 has 3 decimal places.
- Raw Sum: 12.31+0.4+3.027=15.737.
- Rounding: We must round the result to 1 decimal place (the least precise term).
- Final Result: 15.737 rounds to 15.7.
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About This Question
- Subject
- physics
- Chapter
- physics and measurement
- Topic
- significant figures (addition)
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
15.7
- Addition/Subtraction Rule: The result should be rounded to the same number of decimal places as the measurement with the fewest decimal places.
- Analyze Terms:
- 12.31 has 2 decimal places.
- 0.4 has 1 decimal place.
- 3.027 has 3 decimal places.
- Raw Sum: 12.31+0.4+3.027=15.737.
- Rounding: We must round the result to 1 decimal place (the least precise term).
- Final Result: 15.737 rounds to 15.7.
This medium difficulty physics question is from the chapter physics and measurement, covering the topic of significant figures (addition). It appeared in the 2025 exam.
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