Ordinal Numbers Math Activity | Position & Order Video Lesson | Grade 1 Unit 1 Stop explaining and start engaging! This "Watch & Do" Ordinal Numbers Math Center covers positions (1st through 10th) for Kindergarten and 1st-grade students. This is UNIT 1 of the SKIDOS Grade 1 Math Video Series. THE "BRIDGE" METHOD: This resource uses a 3-step system to ensure mastery: WATCH: The animated video introduces ordinal terms (First, Second, Third...) and how position works.DO: Students complete the Video