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