Why is not the answer of 60000 + 1234.0 is not equal to 61234 according to the rules of determining significant figures?

It is so because when two physical quantities are added, the final result is given in the least number of significant figures present in the figures of equation. In this sum 6000+1234, 6000 has the least number of significant figures that is 1 so answer will be expressed in 1 significant figure only. The answer will be 6*103(6 into 10 to the power3).

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