## Chemistry: Molecular Approach (4th Edition)

$(8.01-7.50)/3.002=0.17$
1. Subtract the numbers inside the parentheses. Rule for adding and subtracting: LEAST number of places to the decimal point. In this case, it's two decimal places. $8.01-7.50=0.51$ 2. The dividing rule is to count the Least Significant Figures. In this question, the Least SF is 2. $0.51/3.002=0.16988...\approx0.17$