There are many free worksheets available, especially online, but still the best worksheet is one that you personally draft. This way, you are able to match the level of difficulty of the activity in accordance to the performance level of your own students. It is not bad to reuse worksheets for another batch of students, but once in a while it is also better to vary the activities you give to kids. Worksheets can be made for fun if it is attuned to the current interests of kids. The kids will respond better to activities close to their own interests.
Teachers use printable writing paper sheets. They let their students trace the numbers, letters, words or dots as this is the perfect way for a child to practice the controlled movements of his fingers and wrist. With continued practice or tracing, he will soon be able to write more legibly and clearly.