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