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