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