Question

Using the rules for significant figures, what do you get when you add 24.545 and 307.3

Answer 1

When you add and subtract with sig figs, you add the two numbers first:

24.545+307.3=331.845

You then count the number of sig figs in each original number, and the answer will be the one with the least number of sig figs. In this problem, 307.3 has the least amount of sig figs, which is 4.

Round the answer so that it has 4 sig figs:

331.845 --> 331.8

The answer is 331.8