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