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

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