mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

19 December

1 = 1/2 + 1/4 + 1/8 + 1/16 + 1/16. This is the sum of 5 unit fractions (the numerators are 1).
In how many different ways can 1 be written as the sum of 5 unit fractions? (the same fractions in a different order are considered the same sum.)

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020