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


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