Accountants
Arithmetic at the speed of the source document, with the audit trail intact.
Accounting is arithmetic plus pattern recognition plus episodic memory. The skill that distinguishes a good ledger is not how fast you add, it is whether the row that does not look like the others jumps off the page.
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なぜこれらのゲームか
Math keeps the in-head arithmetic so automatic that the eye is free to scan the row that does not match. Sequences trains the pattern-of-numbers instinct · monthly variance, seasonality, the run-rate that drifts. Memory Game protects the audit-trail recall · who entered what and why, three weeks later.
