There are many opportunities to teach your child how to count. You probably already have books with numbers and pictures, and you can count things with your child all the time. There are counting games and blocks with numbers on them, wall charts and a wide variety of tools to help you teach your child the basic principles of math. Mathematics worksheets can help you take that initial learning further to introduce the basic principles of math to your child, at a stage in their lives where they are eager to learn and able to absorb new information quickly and easily.
There are many good workbooks available for kindergarten children. However with a regular workbook, a child can do each activity or worksheet only once. A good option is to use printable kindergarten worksheets. These are basically digital versions (like ebooks) of worksheets that can be bought and downloaded to your computer from the internet or from CDs and then printed out. The advantage is that you can print out whichever sheet you wish. If you need to re-inforce a certain concept more you can usually print out that sheet again. Of course you will therefore need to have a computer and a printer.