The number of significant figures in the sum of 1.21 x 10^5 and 3.26 x 10^3 is
Correct answer: D. 8
- A. 3
- B. 5
- C. 6
- D. 8
Explanation
To find the number of significant figures in the sum of 1.21 × 105 and 3.26 × 103, first, convert both numbers to the same power of ten: 1.21 × 105 = 121000 and 3.26 × 103 = 3260. Add them to get 124260. When written in scientific notation, this becomes 1.24260 × 105, which has 8 significant figures. Thus, Option D is correct, while the other options underestimate the number of significant figures due to incorrect alignment or rounding.
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