Observed arrival · 2026-08-31

Math Drill Lab: Fix the Mistake, Not Just the Method

mathdrill-lab.com Observed source

Editorial interest 78/100 Selection signal · not a rating of the site

A Japanese high-school mathematics practice site that generates repeatable drills and identifies the specific mistake behind a wrong answer.

Landing page captured for the 2026-08-31 issue.

Field notes

The drill catalogue is divided into 17 Mathematics I units, 17 Mathematics II units, and 11 Mathematics III units. The site says each problem receives freshly generated coefficients, then compares the submitted answer with known error patterns rather than offering only a right-or-wrong result. Examples include forgotten inequality reversals, dropped square roots, missing inner derivatives, and the minus sign in integration by parts.

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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