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