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