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