The result of the operation `2.5xx1.25` should be which of the following on the basis of significant figures?

find the significant figure 263.25

Solve the following with regard to significant figures. 3.9×10^5-2.5×10^4

Round off each of the following quantities to two significant figures : 1.491 xx 10^5 mg

Express the following to four significant figures 2.67891xx10^3

Express the result of the following calculations to appropriate number of significant figures :

Express the result of the following calculations to the appropriate numbers of significant figures 25.6 + 2.3123

Express the result of the following calculations to the appropriate numbers of significant figures 12.4 xx 0.0056