I don’t remember where online I saw this idea, but we have used this number line A LOT. I am currently thinking of extending it to cover larger numbers, as the number line visual is very helpful with math for the youngest. She never really grasped the concept of counting on fingers, although I will often demonstrate using mine. It’s not always convenient to draw dots or use counters. This number line has been our go-to math helper.
If I make another, I will use thicker cardboard. This one uses a paper strip with lines I purchased in a package at Dollar Tree. A pipe cleaner with a bead on it is placed across the line and taped along the edges with packing tape. Note that the pipe cleaner and the bead had to be PINK. That’s my girl.