1. A bounded worksheet specification
Every worksheet type begins with a specification: the intended grade, skill, number range, operation rules, answer format, and standards references. A specification also defines what the generator must never produce.
2. Reproducible problem generation
A worksheet seed and its settings always produce the same ordered set of questions. We use exact representations for money, time, decimals, and fractions so that answers do not change because of floating-point rounding.
3. Independent validation
The answer checker does not simply trust the generator. It recomputes each result and checks constraints such as permitted number ranges, regrouping behavior, remainders, denominator limits, and duplicate questions.
4. Launch quality status
Automated tests generate every skill at standard and maximum worksheet sizes, independently recompute answers, and check duplicate, layout, route, metadata, and accessibility rules. Representative PDFs also receive visual inspection. Automated checks cannot replace expert curriculum review, so we make no teacher-credential claim and keep incomplete state crosswalks and seasonal concepts out of the sitemap.
5. Transparent standards references
Standards labels are concise alignment notes, not a guarantee that one worksheet fully assesses a standard. We link to the issuing agency, record the source version and verification date, and omit a label when alignment would be unclear.
Corrections
If you find a possible error, use the contact page and include the page address, worksheet seed, and question number. We review reproducible accuracy reports before other editorial requests.
Last updated: July 15, 2026