Advent calendar 2019

9 December

Arrange the digits 1-9 in a 3×3 square so that: all the digits in the first row are odd; all the digits in the second row are even; all the digits in the third row are multiples of 3; all the digits in the second column are (strictly) greater than 6; all the digits in the third column are non-prime. The number in the first column is today's number.
all odd
all even
all multiples of 3
today's numberall >6all non-prime

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


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


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