What is the solution to the problem expressed to the correct number of significant figures? 2.13 + 1 = ? a. 3 b. 3.0 c. 3.1 d. 3.13

So,

With addition, we the last digit we keep will be the one which is known for both individual values.

We know 2.13 to the hundredths, but we only know 1 to the ones.  Therefore, we will round off in the ones place.

2.13 + 1 = 3.13 (unrounded)

= 3 (rounded)

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