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