Advent calendar 2018

20 December

Today's number is the sum of all the numbers less than 40 that are not factors of 40.


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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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


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