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It's like the skill needed for calculator usage. You need to be able to quickly estimate what rough order of magnitude, first and last couple of digits, to che
by HPsquared 2y ago
It's like the skill needed for calculator usage. You need to be able to quickly estimate what rough order of magnitude, first and last couple of digits, to check that the result "looks right". Using a calculator to do 100 quick sums is a different skillset to doing 10 by hand.