Question

Please help me determine how many significant figures are in the result of the following calculation.

(1.99×10−2) + (3×10−4) + (3.5×10−3)

Answer 1

My answer is that the result has 1 significant figure because as my book states:
In addition or subtraction, the result carries the same number or decimal places as the quantity with the fewest decimal places.

Answer 2

Right, because 10, 2, 3, and 4 all have 1 significant figure.