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