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