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