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