40
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2138.2
0.50
412820
First, round 5126 to the nearest ten, which gives us 5130. Next, round 13788 to the nearest ten, resulting in 13790. Now, add the two rounded numbers: 5130 + 13790 equals 18920. Therefore, the estimated sum of 5126 plus 13788 is approximately 18920.
If the 64080 refers to meters, then it's already rounded to the nearest meter. If it refers to something else, you need to tell us what it is.