Free Printable Math Worksheets for Grade 3 - Homeschool Math It is not random at first, but students practice the tables based on the patterns in the tables — and (VERY IMPORTANT) they practice the tables "backwards" also. Worksheets can be used for random drilling after the initial stage of structured drilling. Skip-count by 2, starting from 2; Skip-count by 3, starting from 3; Skip-count by 4 ...