There are some new materials being developed now based on what we are learning about how the brain learns. These brain_friendly materials should be an improvement over what has existed. I recently bought a book by Marcia L. Tate titled "Mathematics Worksheets Don't Grow Dendrites." I highly recommend her book. She gives a great deal of information on alternative activities that are better for your child's brain development and for learning.
If you cannot purchase a math work sheet because you think you may not have time to, then you can create on using your home computer and customize it for your kid. Doing this is easy. All you need is Microsoft word application in your computer to achieve this. Just open the word application in your computer and start a new document. Ensure that the new document you are about to create is based on a template. Then, ensure that your internet connection is on before you can search the term "math worksheet" from the internet. You will get templates of all kinds for your worksheet. Choose the one you want and then download.