Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.


Advent calendar 2018

16 December

Arrange the digits 1-9 in a 3×3 square so that the first row makes a triangle number, the second row's digits are all even, the third row's digits are all odd; the first column makes a square number, and the second column makes a cube number. The number in the third column is today's number.
all digits even
all digits odd
squarecubetoday's number

Show answer

Tags: numbers, grids


Show me a random puzzle
 Most recent collections 

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

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2019