I created this practice worksheet for a fun and cute way for my students to practice skip counting by 3's! They are to complete the pattern on each row. The first 2 sheets (copy front and back) are your traditional skip counting numbers by 3's - 12, 15, 18, etc.. The second 2 sheets begin with a non-traditional way to skip count by 3's - 20, 23, 26, etc. The numbers on all sheets go just over 100. I also have Skip Counting Practice Worksheets for 3's, 5' and 10's, as well as a Popcorn Patterns Math Center and Worsksheets available in my TPT store! Enjoy! Thanks to Krista Wallden for the adorable clipart!!