Question

The result of the operation 2.5 X 1.25 should be which of the following on the basis of significant figures?

• A. 3.125
• B. 3.13
• C. 3.1
• D. 31.25

Answer 1

Answer: (C)

$2.5\times 1.25=3.125$

The rule says: Answer to a multiplication or division should be rounded off to a same number of significant figures as possessed by the least precise term in the calculation.

Since $2.5$ has least numbers of significant figure i.e.two, thus, the result should have 2 significant figure i.e. $3.1$

option C is correct