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