mscroggs.co.uk
mscroggs.co.uk

subscribe

Comment

Comments

Comments in green were written by me. Comments in blue were not written by me.
In number 4 what are we to take the difference between? Do you mean the difference between the original number and its reverse? If so when you add the difference back to the reverse you simply get the original number, which is ambiguous. I am not sure what you are asking us to do here.
Dan Whitman
on /blog/37
               
@Dan Whitman: Find the difference between the original number and the reverse of the original. Call this difference \(a\). Next add \(a\) to the reverse of \(a\)...
Matthew
on /blog/37
            ×1   
@Matthew: Thank you for the prompt response! It makes sense now and perhaps I should have read a little closer!
Dan Whitman
on /blog/37
               

Archive

Show me a random blog post
 2026 

May 2026

World Cup stickers 2026

Apr 2026

A new puzzle every day
Mixing Wordle with other games

Feb 2026

Christmas (2025) is over
 2025 

Dec 2025

Christmas card 2025

Nov 2025

Christmas (2025) is coming!

Sep 2025

The partridge puzzle

Aug 2025

TMiP 2025 puzzle hunt

Jun 2025

A nonogram alphabet

Mar 2025

How to write a crossnumber

Jan 2025

Christmas (2024) is over
Friendly squares
 2024 

Dec 2024

A regular expression Christmas puzzle
Christmas card 2024

Nov 2024

Christmas (2024) is coming!

Feb 2024

Zines, pt. 2

Jan 2024

Christmas (2023) is over
 2023 
▼ show ▼
 2022 
▼ show ▼
 2021 
▼ show ▼
 2020 
▼ show ▼
 2019 
▼ show ▼
 2018 
▼ show ▼
 2017 
▼ show ▼
 2016 
▼ show ▼
 2015 
▼ show ▼
 2014 
▼ show ▼
 2013 
▼ show ▼
 2012 
▼ show ▼

Tags

standard deviation hats dinosaurs finite group pokémon logs folding paper thirteen trigonometry bots sobolev spaces warwick matrix of cofactors big internet math-off bempp inline code triangles game of life pac-man propositional calculus hexapawn fractals data royal baby determinants frobel reddit golden spiral weak imposition crosswords live stream preconditioning platonic solids radio 4 crochet numbers gaussian elimination misleading statistics finite element method alphabets menace weather station logic mathsjam rugby news wool final fantasy matt parker regular expressions dragon curves binary golden ratio kings edinburgh craft royal institution european cup christmas asteroids london matrix multiplication zines quadrilaterals pi oeis computational complexity bluesky logo squares ternary graphs pokémon wordle christmas card phd geometry martin gardner harriss spiral draughts signorini conditions nonograms polynomials national lottery machine learning coins mean estimation game show probability braiding latex football countdown javascript matrices sound matrix of minors numerical analysis guest posts captain scarlet 24 hour maths curvature cross stitch dates noughts and crosses probability mathsteroids puzzles crossnumber gather town convergence world cup gerry anderson palindromes statistics bubble bobble hyperbolic surfaces partridge puzzle errors correlation talking maths in public inverse matrices nine men's morris arithmetic folding tube maps crossnumbers anscombe's quartet runge's phenomenon tmip manchester newcastle approximation video games pascal's triangle friendly squares ucl simultaneous equations rhombicuboctahedron dataset exponential growth pizza cutting wordle raspberry pi london underground chebyshev speed rust sorting realhats python mathslogicbot geogebra php games hannah fry data visualisation chess chalkdust magazine graph theory sport fonts a gamut of games pythagoras programming bodmas tetris map projections datasaurus dozen reuleaux polygons books boundary element methods recursion databet go stickers wave scattering the aperiodical coventry arrangement puzzles light stirling numbers error bars electromagnetic field youtube manchester science festival tennis plastic ratio pi approximation day kenilworth people maths turtles interpolation accuracy advent calendar flexagons fence posts cambridge

Archive

Show me a random blog post
▼ show ▼
© Matthew Scroggs 2012–2026