They ARE important.
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There are a many great ways in which you could add significant figures. You could simply add them with math.
Oh, dude, you're hitting me with the math questions, huh? So, like, 6.3528 to 3 significant figures would be 6.35. But, like, who really needs to know that, right? Just round it off and call it a day!
My Chemistry teacher defined trailing zero's as the ones that follow another number. We used them in relation to significant figures. If that's how you're using them (as significant figures) then the numbers are sometimes significant. If they come after a decimal point they're significant. Like 300.0 the 2 zero's before the decimal point are unsignificant, and the one after is (It's also a trailing zero).
To round 3.2550 to three significant figures, we look at the first three non-zero digits from the left. The third significant figure is the 5 in the thousandths place. Since this digit is 5 or greater, we round up the last digit in the hundredths place. Therefore, 3.2550 rounded to three significant figures is 3.26.
bakit ayaw nyo magpakita ng spatial figures