22 December

22 is two times an odd number. Today's number is the mean of all the answers on days (including today) that are two times an odd number.
Clarification: You are taking the mean for answers on days that are two times an odd numbers; ie. the days are two times odd, not the answers.

16 December

Today's number is four thirds of the average (mean) of the answers for 13th, 14th, 15th and 16th December.

Show answer


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


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


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