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