Answer
$a). cm$
$b). 0.946 m^{2}$
Work Step by Step
a). 1 m = 100 cm,
So, 1.245 m = 124.5 cm, and 0.760 m = 76 cm.
The last digit 5 in 124.5 cm indicates that it is an estimated value.
So, the smallest division of the instrument is cm.
b). Area of the table top = $1.245 m \times 0.760 m = 0.946 m^{2}$
Since, 0.760 has the least number of significant figures which is 3, the answer should be also with 3 significant figures.
