Question

express each result using the rules of significant digits :

40.23 + 17.0 = 57.23

and

40.23 x 17.0 = 683.91

Answer 1

57.2 and 684.

When adding, round the answer to the lowest number of decimal positions based on the numbers you are adding.

When multiplying, round the answer to the same number of significant figures as the number you are multiplying with the lowest number of significant figures.