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