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