Here you can find free squared paper A4 (checkered paper) for self-printing.
Checkered and lined papers are the most used printables for sketchpads and for taking notes, as well as for written work and records of all kinds.
Our PDF files available for download online (better for printing and copying than Word, Excel or OpenOffice templates) have several grids that you can then write on. This is cheap and saves the environment.
The blank blank files (squared sheets) are free to download here with/without margins.