mscroggs.co.uk
mscroggs.co.uk

subscribe

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.
triangle
all digits even
all digits odd
squarecubetoday's number

Show answer

Tags: numbers, grids

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

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

Archive

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