Significant Figure - Addition Subtraction
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Significant Figure - Addition Subtraction Rule: Round answers to the least accurate digit.
- 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. 47.89Explanation
The least accurate digit is from 37.71, which has 2 decimal places.Rate this question:
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- 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. 21.40Explanation
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.Rate this question:
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- 3.
What is the result of the following calculation, rounded to the correct number of significant figures? 25.8 - 13.57 + 6.903
- A.
19.1
- B.
19.21
- C.
19.32
- D.
20
Correct Answer
A. 19.1Explanation
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.Rate this question:
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- 4.
Solve and round accordingly: 5.494 - 4.30
- A.
1.19
- B.
9.79
- C.
1.194
- D.
1.2
Correct Answer
A. 1.19Explanation
The least accurate digit is from 4.30, which has 2 decimal places.Rate this question:
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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
- A.
11.45
- B.
11.36
- C.
11. 21
- D.
11
Correct Answer
B. 11.36Explanation
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.Rate this question:
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- 6.
Solve and round accordingly: 63.478 - 52.12
- A.
115.598
- B.
115.59
- C.
115.60
- D.
11.36
Correct Answer
D. 11.36Explanation
The least accurate digit is from 52.12, which has 2 decimal places.Rate this question:
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Oct 30, 2024Quiz Edited by
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Sep 03, 2017Quiz Created by
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