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