Cross-figures are crossword type puzzles, in which instead of words, the solver must type in numbers. The clues are given in terms of mathematical relations between the different answers in the grid, such as "five times 7 down", or "1 across squared". Cross-figures can serve excellent role as educational materials, since require some basic skills with mathematical arithmetics. The puzzles below are created by Yochanan Dvir, from Poland.
Remark: All materials are copyrighted, for personal use only. If you want to use any of them for a book, app, website or periodical, please contact the authors first.