Subject integration with spreadsheets -- Ignoring education is the greatest risk ever

Within the framework of Technological Pedagogical and Content Knowledge, subject integration is one possible solution for the introduction of meaningful digitalization and digitization in schools. This process incorporates that any school subject can be taught with digital support, informatics (computer) classes can be contextualized, and the gap between 'serious informatics' and 'digital literacy' can be minimized. The present paper details how three traditional Grade 3 tasks can be solved in spreadsheets, what skills, competencies, and computer science knowledge of both teachers and students can be developed. The solutions also reveal that analysing, understanding, planning, and discussing tasks is as important as the activity in the spreadsheets, which process plays a crucial role in the preparation of students for their future jobs.