Free Number 1-20 Practice. This product is great for pre-k, kindergarten and first grade students. It will help children to master numbers from 1 to 20 in a many different ways. Children will learn numeral tracing, writing, coloring, drawing, tallying, finger counting, number words, finding, number sequencing, and adding. Also every time they finish a worksheet, they will be rewarded with “I know the number” bracelet.