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