estimation is to think of an answer before measuring the quantity and approximation is to round off.
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Approximation: around, almost, approximation means estimation. You think the number is around the right answer example: 2258+3695= approximatly 6050 estimation= ST Mate
Yes.
just reach closer to a major figure
There is no single word. Mathematical methods, alone, could involve analytical methods, statistical methods of estimation or numerical methods for approximation.
There is no need for estimation here. You can get the exact answer. 649 - 52 = 597