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 

Advent calendar 2020

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2021