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