Screenshot of a gameboard for the game 'Rhombis It' showing a 7 by 7 grid of dots. On the right it says 'Player 1 (Human) is placing blue triangles. Player 2 (Computer) is placing pink squares, Player 1's turn'. There are buttons labelled 'New game' and 'Game report'.

Three Favourite Mathematical Challenges from NRICH

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The NRICH team has selected three tasks (at three different age ranges) to challenge students to think mathematically.