Question

carry out the following operations,and express the answer with the appropriate number of significant figures and units.
a)(5.231 mm)(6.1mm)
b)72.3 g/1.5mL
c)12.21g + 0.0123g
d)31.03g + 12mg

Answer 1

a) 5.231mm*6.1mm = 31.9091 mm

but because of 6.1 contains only 2 significance digits hence the answer will also contains only 2  significance digits.

so the final answer is = 31.91 mm

b) 72.3 g/1.5mL = 48.2 g/mL

but because of 1.5 contains only 2 significance digits hence the answer will also contains only 2  significance digits.

so the final answer is = 48

c) 12.21g + 0.0123g = 12.2223g

but because of 12.21 contains only 2 digits after the decimal point hence the answer will also contains only 2 digits after the decimal point.

so the final answer is = 12.22g

d) 31.03mg + 12mg = 43.03 mg

but because of 12.contains only 0 digits after the decimal point hence the answer will also contains only 0 digits after the decimal point.

so the final answer is = 43mg