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