It is ok, but you could get better estimates.
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4*979 = 4*980 = 4*(1000-20) = 4000 - 80 = 3920.Exact answer = 3916
4000
5000
It is: 4000
In 1 mile there 1760 yards. Hence 4000 / 1760 = 2.272727... miles. That is approximately 2.27 miles or 2 miles 480 yards.