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Q.
Find the value of $12.9\, g -7.06 \,g$. Keeping significant figures in consideration.
Physical World, Units and Measurements
Solution:
In addition and subtraction, the uncertainty of result is determined by the smallest number of decimal places rather than the number of significant figures. Therefore, the correct value of $12.9-7.06=5.84\, g =5.8\, g$.