Do choose worksheets that are appropriate for the childs level, since children can get discouraged easily, if they are unable to perform the activity. Well illustrated worksheets with cartoons are also more likely to appeal to children. Worksheets that use common situations children come across at home, school, in the market place etc and that use common objects known to children would be more relevant.
To Pay or Not to Pay? There are hundreds if not thousands of free printable worksheets available online. These are ideal for filling time or keeping the kids busy on a rainy day, but few of them offer a systematic set of worksheets with activities designed to teach your children a specific set of skills. If education is your aim, you may have to spend a little to get useful, comprehensive worksheets that actually help your child to learn.