How many significant figures should be expressed in the answer to the following: ?

Question

How many significant figures should be expressed in the answer to the following: 720/900 =

1

2

3

6

None of these previous answers

Answer 1

1 significant digit:

720/900=4/5=0.8

this would be expressed as 0.8 and not 0.80 or 0.8000 etc.

Answer 2

well when you work it out the answer will be 0.8

you can either leave it as it is or you can add a bunch of 0 behind the 8 but they don't mean **** the examiner doesn't care if you wrote a million 0 as long as you have 0.8 in front of them

or to try and impress you can write it in standard form

8*10^-1

Answer 3

Significant figures are those digits that make sense in the answer. As for decimals, normally two, three places are significant when there is value in those places.