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