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