Which digits \(X\), \(Y\) and \(Z\) fill this sum?
$$ \begin{array}{cccc} &X&Z&Y\\ +&X&Y&Z\\ \hline &Y&Z&X \end{array} $$

Show answer & extension


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


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


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