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decahedra arrows irreducible numbers fractions multiplaction squares median coordinates pascal's triangle proportion colouring pentagons polynomials polygons square roots perfect numbers star numbers chess square grids cryptic clues multiplication consecutive integers volume geometry albgebra area digital clocks time consecutive numbers prime factors chocolate games rugby floors cube numbers the only crossnumber means matrices sport medians expansions dice scales products ellipses quadratics division averages multiples functions menace indices determinants cubics number ave percentages dodecagons shape mean geometric mean routes circles xor money people maths grids factorials complex numbers factors advent graphs tournaments algebra doubling dates crossnumbers taxicab geometry odd numbers christmas folding tube maps cryptic crossnumbers combinatorics sums clocks regular shapes differentiation surds perimeter geometric means probabilty integration angles square numbers calculus probability neighbours gerrymandering powers prime numbers wordplay books crosswords tangents cards range hexagons rectangles shapes squares planes dominos digits addition 2d shapes binary remainders balancing parabolas palindromes lines axes triangles sequences sets chalkdust crossnumber triangle numbers elections unit fractions trigonometry tiling logic digital products lists coins symmetry even numbers 3d shapes numbers spheres speed bases quadrilaterals sum to infinity partitions integers