Number Formation Worksheets
https://www.twinkl.co.uk/resource/t-n-6039-number-formation-10-to-20-activity-sheet
https://www.twinkl.co.uk/resource/t-n-4411-number-formation-worksheet-0-to-9
https://www.twinkl.co.uk/resource/t-n-287-number-formation-worksheets-10-20
All About Numbers
https://www.twinkl.co.uk/resource/t-n-2546654-all-about-numbers-11-20-activity-pack