Online Math Practice for Kindergarten - Math Worksheets 4 Kids List of Online Worksheets for Kindergarten | Math. Counting to 20. Counting Backward | Up to 20. Sorting and Counting. Numbers in Words from 1 to 20. Writing 1 to 20 from Words. Missing Number Words. Counting to 20 | Number Names. Counting Tens and Ones up to 20 with Pictures.