What we’re learning from practice
An open record of voluntary practice contributions. We publish a result only when there are enough recorded responses to describe the sample clearly.
Collecting observations
There are no publishable comparisons to show here yet. We will not invent a hardest fact, an average score, or a percentile while the sample is insufficient or the reporting service is unavailable.
Window: the last 90 days, excluding the most recent 3 days for reporting delay. Checked 2026-09-22; refreshes daily. At least 100 responses are required for each published row.
How contributions work
The optional checkbox is for adults choosing to contribute a practice session. It is off by default. The tools send the fixed check or fact identifier and whether an answer was correct; blank or “not sure” responses count as needing practice. Typed responses, names, ages, birthdays, and personal maps are not sent in these contribution events.
Events use the site’s existing Google Analytics service, which can process browser information and identifiers under its own settings. This is not a promise of anonymous browsing. Read the privacy details. Local maps and path selections are stored only when you choose Save, and can be cleared in the tool.
What the figures can tell us
For a row, correct percentage = recorded correct responses divided by recorded correct plus incorrect responses, multiplied by 100. A mistake check combines two fixed questions. Multiplication rows keep the two factor orders separate. Only the first contributed set per open tool instance is sent; repeat visits and different devices can still contribute again.
The 100-response threshold is a publication rule, not evidence of a representative sample or a validated measurement. These are self-selected practice sessions. Learners may use hints, see explanations first, or practice already difficult facts. Bots, omitted events, and analytics blockers can affect the counts. We cannot infer nationwide ability, causation, age differences, or learning improvement from these observations.
Keeping the source types separate
Our NAEP reports use official national assessment data. This page uses voluntary site observations. We never combine the two to create a percentile or to compare a child with the country.