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