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