https://www.gov.uk/government/publications/national-curriculum-in-england-mathematics-programmes-of-study
Corbett Maths
https://nrich.maths.org/primary
Problem Solving
http://www.kenkenpuzzle.com/#
https://www.setgame.com/set/puzzle
https://webgamesonline.com/mastermind/
https://www.mathsisfun.com/games/bulls-and-cows.html
Primary Maths Challenge
https://www.inquirymaths.com/
UKMT
https://www.drfrostmaths.com/page.php?id=5
Parallelograms - Free weekly maths challenges
https://parallel.org.uk/introduction
NRich
Enrichment
Open Middle
https://www.openmiddle.com/whats_open_middle/