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