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Advent calendar 2016

18 December

The smallest number whose sum of digits is 25.

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Sunday Afternoon Maths LXVII

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

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