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