Here are a few websites that could help:

 

https://www.mathsisfun.com/

 

https://whiteroseeducation.com/parent-pupil-resources/maths/maths-with-michael

 

https://whiteroseeducation.com/1-minute-maths#download

 

https://www.topmarks.co.uk/maths-games/5-7-years/counting

 

https://www.cgpbooks.co.uk/info/times-table-tester

 

https://www.cgpbooks.co.uk/primary-resources