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