How many significant digits are in this numer 74.30?

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How many significant digits are there in 4000000?

There is one significant figure (which I assume you are referring to). However there are 7 digits involved, of which all are significant. Each digit is important and special

How many significant figures are in 74.30?

Answer: four. All written decimals are significant (even if it is 0). However if you have a physics computation where one number turns out to be x = 2.0 (2 significant fi