There is no such thing as scientific digits. There are 6 digits in the number of which 3 are SIGNIFICANT (not scientific) digits.
5.4 x 102.
Yes they are, if they are large numbers. You do not need to count how many digits there are.
One digit
In scientific notation that number would be written as 7.080 x 10-3 and it would have four significant digits.
There is no such thing as scientific digits. There are 6 digits in the number of which 3 are SIGNIFICANT (not scientific) digits.
5.4 x 102.
540 what?
There is no way to know how many significant digits are in 33000. If you are forced to choose then there are 2 significant digits but, again, there is really no way to tell. If the count of significant digits is important, the number should be expressed in scientific notation.
270 of them.
Yes they are, if they are large numbers. You do not need to count how many digits there are.
One digit
The answer depends on what 540 refers to.
540 ÷ 60 = 9
In scientific notation that number would be written as 7.080 x 10-3 and it would have four significant digits.
The "fancy" name for fingers and toes is digits.
540 milliliters = 0.54 liters