It is only multiplications and divisions (same rule), so not mixed operations. So you take the least number of sf. # 19 : 6,29 X 10^6; # 20 : 1,3 X 10^-2.
270 only has 3 sf when the "0" is followed by a decimal. 270 is 2 sf while 270. is 3 sf. With values that have a trailing zero or more than one trailing zero, it is best to express the value in scientific notation so the trailing zero is clearly defined as significant or not. 2.70x10^2 would be 3 sf, while 2.7x10^2 would be 2 sf. Hope this helps
Thank you for providing an explanation that actually makes sense!
What about the other two problems?
It is only multiplications and divisions (same rule), so not mixed operations. So you take the least number of sf. # 19 : 6,29 X 10^6; # 20 : 1,3 X 10^-2.
6:33 Wrong. It is not 270 (which has 3 sf), it is 2,7 X 10^2 (which has 2 sf). Correct that please.
270 only has 3 sf when the "0" is followed by a decimal. 270 is 2 sf while 270. is 3 sf. With values that have a trailing zero or more than one trailing zero, it is best to express the value in scientific notation so the trailing zero is clearly defined as significant or not. 2.70x10^2 would be 3 sf, while 2.7x10^2 would be 2 sf. Hope this helps
love this!
Doctor, you can e-mail