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