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