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Box of cards with pen£6.99Currently unavailable on this website WARNING! Not suitable for children under 36 months because of small parts. Choking Hazard. Ink from pen may not be washable. A pack of wipe-clean cards with brain-teasing maths puzzles to solve. Puzzles include "missing angles", "honeycomb number game", "missing symbols" and "cross number", with all the answers given on separate cards. Includes a special pen to write on the wipe-clean cards, and a scribble card for workings out.