How We Check Our Worksheets
Our trust is built on verifiable processes rather than marketing claims: answer keys mathematically proven by automated tests, machine-tested print pagination, and zero collection of child data.
1. Answer Keys Are Proven, Not Eyeballed
Every worksheet generator in our library runs automated invariant test suites over 10,000 randomly generated sheets before any code update is published.
In parent language: we make the computer solve its own sheets ten thousand times.
An independent calculation in our test suite verifies that every answer key matches the problem, subtraction answers stay non-negative, divisions divide evenly, and no duplicate problems appear on the same sheet.
If even one generated sheet produces an incorrect answer or violates a mathematical invariant, the automated test suite fails and the site build stops.
2. Print Layout Is Tested Like a Product
A worksheet with problems cut across page boundaries or trailing blank pages wastes paper and ink in a busy classroom.
Automated print tests simulate physical printing in headless Chromium across both standard US Letter (8.5 × 11 in) and International A4 (210 × 297 mm) paper formats.
These tests measure the bounding boxes of rendered problem cards, asserting that individual problems never split across page breaks and that zero blank or trailing pages sneak in.
3. No Accounts, No Child Data
Printing and practicing worksheets requires no account creation, no login, no password, and no email address.
All math problem generation and answer calculation happen 100% inside your web browser; no student work or configurations are ever sent to an external server.
Display preferences (such as Large Print mode and Dyslexia-Friendly font) live only in your own browser's local storage under a single disclosed key (msg_display_prefs).
We maintain a clear policy commitment: we will never require an account to print, we will never sell visitor data, and we will never track children. You can read our complete, code-audited disclosures on our Privacy Policy.
4. Curriculum Sources & Corrections Commitment
Our grade skill maps organize mathematical topics into the sequence most classrooms meet across the school year.
These progressions are drawn from published curriculum sequences: EngageNY / Eureka Math module sequences (NYSED), Illustrative Mathematics scope & sequence, and Common Core State Standards for Mathematics domain clusters.
This site is an independent educational practice tool and is not affiliated with or endorsed by these curriculum authors. You can explore the full progression on our grade skill maps.
Direct Corrections Commitment
Automated tests verify mathematical invariants, but human eyes still find edge cases. If you notice an incorrect calculation or confusing problem, email us directly at [email protected]. We plainly commit to investigating and fixing any verified mathematical error promptly in our codebase.