I Can Calculate 1 and 2 are now also available in a large A4 format. They correspond in content to the small A5 booklets. The star booklets were designed for independent work by teachers and are tailored to the individual learning and performance level of the child. I Can Calculate 1 includes a writing number course, addition and subtraction within the number range up to 10, and understanding the number range up to 20. I Can Calculate 2 addresses addition and subtraction up to 20. Additionally, it introduces the number range up to 100 and provides a final overview of the learning objectives covered. Furthermore, in the series: I Can Calculate 3 then covers the number range 1-100 with learning objective overviews. I Can Calculate 4 addresses the number range 0-1000, and I Can Calculate 5 covers the number range 0-1,000,000.