Sometimes we receive worksheets in PDF from our daughter’s teachers for her to work on. Our printer doesn’t work very well, and I know some of the families don’t have a printer at home, so in order to make the PDF editable for her and her classmates to complete using a computer, I use Google Slides..
Convert your PDF to JPEG or PNG, I’m a Windows user so I’ve used the snipping tool that comes with it (you can use any screen capture tool).
Then open a blank Google Slides file. Go to File > Page Setup, select Custom and set its dimensions to 7.5 x 10 inches.
After that, go to Slide > Edit Master and paste the screen capture of your PDF. Resize it to fit your slide.
Once done, you can insert text boxes for your students to complete the worksheet.
And as Tanya says, you can color the text boxes so that students know where to type.