Posted by Coralie on Sunday, February 15, 2009 at 6:18pm.
Another confusing significant digit problem. I added 36.6 and 2.4, and divided the result by 4.803. The book says the answer is 7.91, but I don'[t see how that could be, since the lowest number of significant digits in the problem is two (2.4). I think the result should be 7.9, not 7.91. Why is this? Thanks ~Coralie.

Chem  bobpursley, Sunday, February 15, 2009 at 6:21pm
Nope. When adding or subtracting, look for the lowest place value that is significant, in this case, tenths.
Numerator is 39.0 three sig digits.

Chem  DrBob222, Sunday, February 15, 2009 at 6:25pm
First, 36.6 + 2.4 gives 39.0, a number with three s.f. When you divide by 4.803 that give you a number of 3 s.f. for the answer; however, the answer isn't 7.91, it is 8.11993 which rounds to 8.12. Did you make a typo in the problem?
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