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