F×F (0xF times 0xF) is a small SPA to train multiplication of hexadecimal numbers on your own.
See the running app at s-ol.github.io/ftimesf!
in german, when children learn to multiply, the multiplication tables with numbers 1 - 10 they are first taught to learn by hard are called 'kleines Einmaleins' ('small one-times-one').
to test & develop (live reloading):
npm start
to build:
npm run dist
built using react, material-ui and material-react-generator.