Question:
The result of \(3.456+2.1\) with correct significant figures is:
The result of \(3.456+2.1\) with correct significant figures is:
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For addition and subtraction, round the final answer according to the least number of decimal places, not the least number of significant figures.
Updated On: Jun 3, 2026
- \(5.556\)
- \(5.56\)
- \(5.5\)
- \(5.6\)
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The Correct Option is D
Solution and Explanation
Concept:
In addition and subtraction, the final answer should be rounded according to the least number of decimal places among the given numbers.
Step 1: Add the given numbers.
\(\displaystyle 3.456+2.1=5.556\)
Step 2: Check decimal places.
The number \(3.456\) has three decimal places. The number \(2.1\) has one decimal place. So, the final answer must be rounded to one decimal place.
Step 3: Round the answer.
\(\displaystyle 5.556\) Rounded to one decimal place: \(\displaystyle 5.6\)
Step 4: Final conclusion.
Hence, the correct result is: \(\displaystyle \boxed{5.6}\)
In addition and subtraction, the final answer should be rounded according to the least number of decimal places among the given numbers.
Step 1: Add the given numbers.
\(\displaystyle 3.456+2.1=5.556\)
Step 2: Check decimal places.
The number \(3.456\) has three decimal places. The number \(2.1\) has one decimal place. So, the final answer must be rounded to one decimal place.
Step 3: Round the answer.
\(\displaystyle 5.556\) Rounded to one decimal place: \(\displaystyle 5.6\)
Step 4: Final conclusion.
Hence, the correct result is: \(\displaystyle \boxed{5.6}\)
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