3000 + 6000 = 9000
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It is 5000.
Front end estimation is simpler but usually more crude.
It is front-end estimation.
It depends on what you are rounding to. If rounding to the nearest ten, the 9 at the end decides which way to round it, and being a 9, it rounds up. If rounding to the nearest hundred, it was is the 7. If rounding up to the nearest thousand, it is the 8.
To the nearest hundred, 900