# Chemistry 101 - significant figures [closed]

So i had my first chemistry 101 exam and got 21/25 , but iam not sure about one question, it's about significant digits , can u guys check if my answer is true or false as shown in picture. Thanks

## closed as off-topic by Mithoron, ron, airhuff, Tyberius, andselisk♦Nov 16 '17 at 22:58

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• We generally try to avoid just checking answers on this site. Usually, we want to see what your thoughts on the question were/what research you have done to try to arrive at an answer. – Tyberius Nov 16 '17 at 16:59

It looks like the answer should be B. A good rule of thumb to follow is that your number of significant digits goes one past what is directly marked on your ruler, graduated cylinder, etc. The significant digit should be the one which has some uncertainty. Choosing A implies that the error in your measurement is on the order of $\pm1\pu{cm}$ whereas B correctly shows that you can make a reasonable measurement on the order of $\pm0.1\pu{cm}$.