Primary ruled paper for young writers
A child still learning letter shapes needs more than one line. Primary ruled paper gives them a top line, a dotted middle line, and a baseline, so letter height stops being guesswork.
Why the dotted midline matters
The midline shows where lowercase letters stop and where the taller letters keep going. Without it a child has no way to see that an a should be half the height of an h, which is why letter size looks uneven on plain ruled paper.
The 1 inch rule
Primary ruled paper is conventionally a 1 inch rule, which is what the primary option prints. That gives 8 lines on Letter and 9 on A4, sized so a young hand can fit a letter comfortably between the guides.
Paper made for kindergarten
If you are printing specifically for kindergarten or preschool, the kindergarten lined paper page opens with the primary ruling already set and covers the sizes used at that age.
