The current catalog contains 379 worksheet sources. 222 have examples, answer checks, or reference-model support. The dated checks below describe what was actually tested. It combines source checks, computed answer checks, and representative visual inspections. It is not an independent educational assessment or a native-speaker review of every translation.
Latest checks · October 30, 2026
Catalog: 379 sheets; answer or reference support: 222. These counts come from the same catalog and support rules used by the website, rather than a separate manually maintained total.
On October 28, all 376 printable screens were checked for question marks in writable answer cells. Ten additional sheets, 60 cells, were cleared; 100 language-specific pages and single-page A4 PDFs were checked, with ten Korean PDF renders reviewed. Question marks used by multiple-choice prompts and sentence punctuation were retained.
Five picture-matrix sheets were added with 30 questions, six distinct choices per question, and independently checked cellwise rules and rotations. Fifty language-specific pages and PDFs were checked. This does not establish age norms or IQ scores.
On October 30, guidance on 15 sheets was edited to remove definitive claims about learning outcomes and to add instructions or examples drawn from the actual printable. Existing practical guidance was retained. This is an editorial correction, not a user study, a professional assessment, or certification of every translation.
Recent changes also include writable blanks in number matrices and missing-operation sheets, removal of repeat-group underline hints on the six-step pattern sheet, printable symmetry instructions and examples, and self-contained missing-arrow questions.
Content differentiation follow-up: 36 cognitive sheets now have task-specific checks and concrete stage summaries. Five picture-matrix guides explain their separate rules and show a differing cell for each wrong choice. Overlapping reverse-section, coin, addition and place-value questions were revised; the two fraction/reflection matrices now use different row/column cycles and answer positions. Smaller retained overlaps are explicitly identified as review in the affected guides.
Automated checks cover syntax, ten-language fields, selected mathematical answers and layout. Maintainer PDF inspections are distinct from physical-printer trials, native-speaker review, and use with children. We have not claimed those trials took place.
What was checked
- All 379 sources: script syntax and the presence of titles, descriptions, tags, parent tips, skill notes, and next steps in ten languages. Presence checks do not prove that every sentence or picture is accurate.
- October 26 review, 95 worksheets: arithmetic including remainders, decimal comparisons, shaded fractions, number bonds, place value, skip counting, clock times and matching, four Sudoku puzzles, and fourteen matrix-reasoning sheets, and seven balance-scale reasoning sheets. Answers are computed from the same questions shown on the page. Matrix choices are checked against row and column rules; Sudoku checks require one solution.
- 10 measurement sheets: units, ranges, intended values, ruler subdivision, and cup calibration. Cup readings between numbered lines remain estimates; the answer panel identifies the values used to draw them.
- 8 science sequencing sheets: order and matching data, with stage labels in all ten languages. These are simplified teaching diagrams, not a complete account of biological or physical processes.
- 6 Spanish and Portuguese handwriting sheets: reference letters and comparison models. Handwriting has models rather than one numerical answer.
Corrections made
- The three ruler sheets now use 1 mm divisions and a longer half-centimeter mark. The half-centimeter explanation was updated to match.
- The four volume sheets now show straight-sided cups so equal height intervals represent equal volume intervals. Printed instructions explicitly ask for estimates between labeled lines.
- Sudoku 9×9 sheet 4 had multiple solutions. Six clues from its existing intended solution were added; the completed puzzle now has one solution.
- Seven balance-scale sheets used toy pictures but still named fruits in the guidance. The titles, descriptions, and picture references now match the toys. Balance answers are checked from the direction of each scale, including whether the question asks for the lightest or heaviest item.
- Sudoku sets A–D are practice variants, not calibrated difficulty levels. Sets A–C share the same blank positions with relabeled digits, which is stated in their guidance. Set D has a separately checked unique solution.
- Five place-value sheets now use their existing translated titles inside the printable, instead of falling back to English in eight languages.
Using the answer panels
222 worksheets now include examples or reference models and a collapsible checking panel in all ten interface languages. Try the activity before opening the answers. Numerical answers follow printed order; clock matching points to the time label's row, and Sudoku solutions are listed row by row. R means remainder in division answers, with a multiplication-and-addition check alongside it.
Further graphic checks and worked explanations
We added checks and answer support for 50 more worksheets: nine mazes, seven pattern sheets, five command grids, eight cube-counting sheets, three nets, two reverse-section sheets, three section sheets, five picture analogies, two spatial-rotation sheets, two number sequences, three mixed-puzzle sheets, and the space picture comparison. The fourteen existing matrix sheets also have completed visual examples. Maze paths are checked against the drawn walls, command routes at every intermediate step, and rotated shapes by their polygon geometry. The seven picture differences were identified by direct comparison of the two unchanged originals; pixel differences alone do not determine their count.
The 222 supported sheets now include task-specific methods. Sudoku examples show one forced move with its excluded candidates; decimal examples align place values; matrix and analogy checks explain the required features and compare the alternatives. Maze, pattern, matrix, and picture-comparison diagrams are available in the answer panels.
New corrections include ambiguous symmetric rotation shapes, an off-grid intermediate command, ambiguous shape replacements and sections, incompatible net edges, and missing support cubes in one stack. We also corrected affected instructions and translations, removed guidance about nonexistent command-grid walls, and revised claims that learning support would disappear automatically. These are targeted corrections, not certification of every translation by a native speaker.
Read four actual file-check examples with screenshots. They are maintainer checks, not invented parent or child testimonials.
What this does not establish
The other 157 worksheets are outside this answer/reference-model support coverage. Some, such as drawing and coloring, do not have a single correct finished result. Open-ended artwork, other language models, and educational claims outside the checks described here still require separate review. Representative layout checks also cannot replace checking a downloaded sheet before using it with a child.
If a question is unclear or an answer seems wrong, send its URL, language, and question number through the contact page. We will check the source data and correct confirmed errors in the page, download, and preview.