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