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