Question Detail
Question
What is the result of adding 123.5 m and 2.73 m, expressed with the correct number of significant figures?
Correct Answer
Option B is the correct answer.
Detailed Explanation
For addition and subtraction, the result should have the same number of decimal places as the measurement with the fewest decimal places. 123.5 has one decimal place, and 2.73 has two. The sum is 126.23, which must be rounded to one decimal place, giving 126.2 m.
Hint
Focus on the number of decimal places, not the total number of digits, when adding or subtracting.