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Advent calendar 2017

24 December

Today's number is the smallest number with exactly 28 factors (including 1 and the number itself as factors).

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

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