mscroggs.co.uk

mscroggs.co.uk

blog puzzles academic talks contact subscribe ↓ ☰ ↓

Comment

Comments

Comments in green were written by me. Comments in blue were not written by me.

2017-11-15

If we could just teach young children about positive and negative numbers, then this wouldn't be a problem. Subtraction is just the addition of negative numbers. Division is also the multiplication of fractions. This is why BOMA/PEMA is the optimal method. I think MEDUSA is very creative, though.

Blan
on /blog/40

×1

×1

×1

×1

×1

Archive

Show me a random blog post

2025

Mar 2025

How to write a crossnumber

Jan 2025

Christmas (2024) is over
Friendly squares

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

Tags

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2025