This is a product that teaches children how to count by 10s. I made this to re-enforce my son's counting by 10s skill. It includes a tracing number exercise, a reading exercise and building the number exercise using a Base 10 rod. If you don't have a Base 10 rod, you can easily substitute Lego bricks, erasers, blocks, etc.
I suggest you print the worksheets on card stock and then laminate them for durability and also, so you can use them again and again for your children or classroom.