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