This bundle is made of 6000+ worksheets (Largest number of additions in TPT) of content on addition with no grouping. It includes questions page and answer key page. There are totally 605 PDF files. Each pdf has 10 worksheets in it. So, with answer key each pdf is made of 20 pages. The Worksheets are based on 1 digit + 1 digit2 digit + 1 digit2 digit + 2 digit3 digit + 2 digit3 digit + 3 digit4 digit + 3 digit4 digit + 4 digit