48,369 + 39,231 = 87,600 (this is exact and not an estimate).
It is difficult to provide an answer asking us to estimate, as we do not know how accurate you would like our estimation to be.
For example we could, easily, estimate that the answer is 50,000 + 40,000 = 90,000 (here we have rounded each figure to the nearest 10,000).
Or we could round to the nearest 1000 for a closer approximation, i.e. 48,000 + 39,000 = 87,000 and so forth...
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300+60=360
2048
4+1=5. Plus 4 equals 9. Plus 77685769844446473 equals 77685769844446482. Plus 3 equals 77685769844446485. Plus 8 equals 77685769844446493. Plus 1 equals 77685769844446494. Plus 9870998342523322424 equals 1064785604097768918. Plus 4 equals 1064785604097768922.
It is the property that equals plus equals are equals.
the answer is a