Question

4- Calculate to the correct number of significant figures.

a/ 89.3 x 77.0 x 0.08

b/ (5.01 x 10^5) / (7.8 x 10^2)

c/ 4.005 x 74 x 0.007

d/ 453 / 2.031

Answer 1

a/ 89.3 x 77.0 x 0.08
   = 550
( least significant among all 3 terms is 2. So answer should be written in 2 significant figure)

b/ (5.01 x 10^5) / (7.8 x 10^2)
   = 6.4*10^2
( least significant among all 2 terms is 2. So answer should be written in 2 significant figure)

c/ 4.005 x 74 x 0.007
   = 2
( least significant among all 3 terms is 1. So answer should be written in 1 significant figure
0.007 has 1 significant figure)

d/ 453 / 2.031
   = 223
( least significant among all 2 terms is 3. So answer should be written in 3 significant figure)