47. When performing addition or subtraction with measurements, how should you determine the number of significant figures in the result? - Sindh Board (stb)

                              

EXPLANATION

Question: When performing addition or subtraction with measurements, how should you determine the number of significant figures in the result?

• a) Round the result to the nearest whole number.
• b) Count the total number of digits in the original measurements.
• c) Use the same number of decimal places as the measurement with the fewest decimal places.
• d) Use the same number of significant figures as the measurement with the most significant figures.

ANSWER: c) Use the same number of decimal places as the measurement with the fewest decimal places.

EXPLANATION:

The number of significant figures in the result of an addition or subtraction problem should be the same as the number of decimal places in the measurement with the fewest decimal places. So the answer is (c).

Option (a) is incorrect because rounding the result to the nearest whole number would not take into account the significant figures of the original measurements.

Option (b) is incorrect because the total number of digits in the original measurements does not necessarily reflect the number of significant figures.

Option (d) is incorrect because the number of significant figures in the result should not be more than the number of significant figures in the measurement with the most significant figures.

So the answer is (c).