New problems on every refresh
Set the range, see the page, print it. Every sheet comes with a matching answer key, and the address bar holds the exact set of problems — so the same link always prints the same worksheet.
Most worksheet sites are archives: someone made a PDF once, and everybody downloads that same PDF. It works until you need a second version for the other half of the class, or the numbers turn out to be too easy, or you want the same exercise again next term without the pupils recognising it. Here the page is built when you ask for it, from settings you can see, and a new draw is one button away.
Every setting and the random seed live in the link. Bookmark it and you have that worksheet forever; send it to a colleague and they get exactly what you saw. Change one number and the address changes with it. Nothing is stored on our side, and there is no account to make before you can print.
Sheets print black on white with no background fills, because a teacher printing a hundred copies is paying for every drop of ink. The page defaults to US Letter and switches to A4 in one click, with the layout measured in millimetres rather than pixels so neither format comes out cropped or scaled.