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