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