Good question :) We've a similar challenge to you, kids a few years younger, despite some efforts in school by teachers, they still don't get fed enough of the

Good question :) We've a similar challenge to you, kids a few years younger, despite some efforts in school by teachers, they still don't get fed enough of the cool hard stuff they're hungry for, and youngest in particular finishes schoolwork early including extensions and gets bored. So I've done some searching possibly similar to you. found this : https://ukmt.org.uk https://ukmt.org.uk. which has some good resources. Also just purchased off eBay this weekend, the Murderous Maths series by Kjartan Poskitt. Remains to be seen how good that'll be, might be a bit young for yours, although he did write some other books possibly for older kids. Some schools here in UK use this : https://sparxmaths.com https://sparxmaths.com. Maybe you can use that as an individual? Main thing is make sure to keep it fun, right? Playing card games is good too I think. Ones our family played include - "Oh hell". - like a simpler Bridge, you declare how many tricks you'll make and after a round you score 1 point for each trick plus an extra 10 if you made exactly what you said you would no more no less - quite tactical especially if you plan to make 0 tricks. "Black Lady" - sometimes called "Hearts" - each Heart is 1 bad point, Queen of Spades 13 bad point, King of Spades 10 and Ace 7, aim of the game is to not win tricks containing the bad cards. Seems to me those card games teach the brain to work in such a way that helps when doing various unrelated maths problems later on.