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