Every fact timed separately, so the result is a list of what to practise rather than a number
A score out of thirty tells you very little. This times every fact on its own and reports which ones took longer than three seconds or came out wrong, because those are the facts costing you time inside every longer calculation. Nothing is saved and nothing leaves your browser.
Under about a second for a fact that is genuinely automatic. This check flags anything over three seconds, which is the point at which a fact is being worked out rather than recalled.
The 6, 7 and 8 rows multiplied by each other. They have no digit pattern to lean on, so they cannot be reconstructed from a rule the way the 9s and 11s can.
Because multiplication is commutative, so 7 × 8 and 8 × 7 are the same fact. Asking both would double the length of the check without testing anything extra.
No. The check runs entirely in your browser, nothing is stored and nothing is sent to us. Closing the page loses the result.
Every couple of weeks. Day-to-day variation is large enough that a single run tells you about today rather than about your progress.