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**1. The problem statement, all variables, and given/known data**

If we add 3.46 and 2.3 we get 5.76.

we can round it to two significant numbers 5.8 because there is the least two significant digit 2.3 but If we add 2.3 X 10^4 + 1.6 X 10^3 = 2.3 X 10^4 + .16 X 10^4 = 2.46 X 10^4. Here can we round off to two significant figures (2.5 X 10^4) because there is also the least two significant digit 2.3 present? Please explain.

## Homework Equations

Same as above

## The Attempt at a Solution

1. 3.46 + 2.3 = 5.76 rounded off to 5.8

2. 2.3 X 10^4 + 1.6 X 10^3 = 2.3 X 10^4 + .16 X 10^4 = 2.46 X 10^4

If I round it off, then what will be the answer and why?