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There are three significant digits. I am not sure what scientific digits are!

Q: How many scientific digits are in 5.40?

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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.

Related questions

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.

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.

540 what?

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.

270 of them.

The "fancy" name for fingers and toes is digits.

The answer depends on what 540 refers to.

540 ÷ 60 = 9

540 milliliters = 0.54 liters