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MathMaker

A web app for 3rd and 4th graders to practice multi-digit multiplication on a place-value grid.

  • Type a problem from your workbook (e.g. 364 × 57) or generate a random one.
  • The grid sets itself up automatically: place-value columns, carry-over rows, partial-product rows, and a final sum row, all aligned.
  • Hints catch the common mistakes (swapping the carry and ones digit, adding instead of multiplying, multiplying instead of adding) and explain the next step.
  • Once the multiplication is correct, the answer digits turn green as the child enters them in the bottom row.

Run locally

It's a static site — just open index.html in a browser, or serve the directory with any static file server:

python3 -m http.server 8123

Then visit http://localhost:8123.

Install as a Home Screen app (iPhone / iPad)

  1. Open the hosted URL in Safari.
  2. Tap the Share button → Add to Home Screen.
  3. The app launches fullscreen from the Home Screen with its own icon.

Tech

Plain HTML, CSS, and JavaScript — no build step, no dependencies. The grid is laid out with CSS Grid; state is kept in memory and persisted to localStorage (current problem and solved count).

Icons

Source PNG is in icons/ along with the resize script (make_icons.py) that generates the various sizes referenced by manifest.json and apple-touch-icon.