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