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.
A lot of effort goes in generating printable maths lessons for children of all ages. Equations have been a source of great confusion for most children and these can be easily learnt by solving the worksheet pages. The worksheets can also be prepared according to the needs of the child. The customised work papers can have a limited number of problems, a predicted font size and a topic of interest.