Below are some useful maths websites 

Arithmetic practice – printable or online SATs style tests

https://mathsbot.com/primary/ks2

Arithmetic practice – compact version that can be completed online

https://mathsbot.com/primary/ks2Mini

Free CGP 3 x ten minute tests for both maths and SPAG with a timer. It tells them what they have got wrong at the end and gives them a score.

https://www.cgpbooks.co.uk/resources/ks2-sats-online-10-minute-tests?srsltid=AfmBOooewjaqxttHY0lMLYlgIt_14sDnWPux1zq8tAgf-x4WIZ4oZQI3

Who wants to be a millionaire game for maths

https://www.mathsisfun.com/games/mathionaire-general-math-quiz.html

Maths adventure game

Guardians: Defenders of Mathematica – KS2 Maths game - BBC Bitesize