When you add or subtract numbers, keep the fewest number of decimal places in the calculation. 2.46 6.1743 = 8.63 to 2 decimal places 2.5 6.1743 = 8.7 to 1 decimal place When performing mathematical operations, sometimes determining the correct number of significant figures is more complicated. As a general rule, the measurement with the least amount of precision determines the amount of precision in the answer. If there is more than one way to calculate an answer, the answer with the greatest precision will be expected. Suppose we want to charge a flask with 2.4 g of sugar. We put the empty flask on a balance and it is determined to weigh 190 g. Enter the weight we would expect to see on the balance when we're done adding the sugar. WebAssign will check your answer for the correct number of significant figures. 192 Check the number of significant figures. g Obviously, the precision in the weight of the flask is not great enough to allow for a precise determination of the amount of sugar added, so we move to a different balance: the empty flask is determined to weigh 190.0 g and we, again, want to add 2.4