the teacher said something about doing the correct sig figs..im not sure if it applies to this, im so confused!

10.2* 7.5 =76.5?

27.1/5.31 =5.103578154425612??

2.712 + 10.8= 13.512?

2 answers

The first to the correct number of sig digits (determined by 7.5, the least precise number) will be 77
The second should be to three sig digits, 5.10
The third should be precise to the tenths digit, (determined by 10.8, the least precise number),or 13.5
http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson23.htm