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