1 Minute Maths 

Android - https://play.google.com/store/apps/details?id=com.whiterosemaths.oneminutemathsks1&hl=en_GB  

Apple  - https://apps.apple.com/gb/app/1-minute-maths/id1584136366

Topmarks  - https://www.topmarks.co.uk/search?subject=16&ageGroup=2 

Times Table Rockstars - https://play.ttrockstars.com/public 

Maths Frame - https://mathsframe.co.uk/