### Sig fifs in 750

Posted:

**Thu Apr 12, 2018 9:40 pm**Does the number 750 have two sig figs? And would the number 750.01 have 5?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=9&t=30639

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Posted: **Thu Apr 12, 2018 9:40 pm**

Does the number 750 have two sig figs? And would the number 750.01 have 5?

Posted: **Thu Apr 12, 2018 9:49 pm**

Yes! So 750 only has two sig figs because of that 0 at the end. It would be 3 if it was 751 because it is ambiguous whether that 0 is there due to rounding or if it is exactly 750, so it can be said that only two numbers are significant figures. In 750.01 and even 750.00, there would be 5 significant figures because the last numbers are exact. Hope that helps.

Posted: **Thu Apr 12, 2018 10:26 pm**

does this work the same way in reverse? like is .075 only 2 significant figures or is it 3?

Posted: **Sat Apr 14, 2018 7:23 pm**

I'm pretty sure the zero after the decimal point is not significant. So, for example the number 0.0000023 has two sig figs. (Sourcehttp://www.rpi.edu/dept/phys/Dept ... ode12.html)

Posted: **Sat Apr 14, 2018 8:08 pm**

Yes, both of those would have two significant figures. Putting decimals less than one in scientific notation makes it very easy to tell which numbers are significant as only the digits that appear before the "x10" are.

Posted: **Sat Apr 14, 2018 8:09 pm**

yes the value of 750 only has 2 significant figures as a significant figure is any non-zero digit and because it came after too the right of the 75 it is not considered a significant figure which is why it only contains 2.

Posted: **Sun Jun 10, 2018 11:59 pm**

A super easy way of counting sig figs is a quick trick I was taught in High School Chem. The Pacific and the Atlantic. You orient both oceans as if looking on a map. Then if a decimal is (P)resent then you start on the left side of the number and start counting with the first number larger than zero. If a decimal is (A)bsent then you start on the right side of the number and start counting when a number is larger than zero.

Therefore, 750 has no decimal so it has 2 sig figs.

Therefore, 750 has no decimal so it has 2 sig figs.