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