mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Reverse bases again

Find three digits \(a\), \(b\) and \(c\) such that \(abc\) in base 10 is equal to \(cba\) in base 9?

Show answer & extension

Tags: numbers, bases
If you enjoyed this puzzle, check out Sunday Afternoon Maths VIII,
puzzles about numbers, or a random puzzle.

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

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

Archive

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