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