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