The answer is a Chromebook.
They start at about £140 which isn’t bad considering the software is mostly free – including Word processing, Spreadsheets and Presentation (all online rather than installing anything) to enable a child to do their homework up to and into Secondary School.
The ones I bought (Acer Chromebook 11 CB3-132) are no longer available but they easily connected to the internet and printer etc.
I bought two over a year ago and they’re still going strong.
If I needed a laptop to take with me when travelling I’d buy another Chromebook and leave my beloved MacAir at home.
Disclaimer: This is Ninja Maths Master opinion – no promotion / sales / or arm-twisting involved – that wouldn’t work with me anyway!