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