Answer:
0.022
Step-by-step explanation:
The first number is:
0.0204, and has 4 sig figs (bolded numbers are sig fig contributors)
The second number is:
0.002 and has 3 sig figs
The answer we get must have the same number of sig gifs as the lowest sig fig count of the given values. In this case, the answer would have 3 sig figs and not 4 because the smaller one is 3.
Do the calculations and then round.
0.0204 + 0.002 = 0.0224, and since we only want 3 sig figs, go from the right of the period and count 3 numbers, which would be 0.0224, and notice how the 4 isn't included. This means that the final answer should be 0.022