Master Place Value (Tens & Ones) with this engaging "Watch & Do" Video Lesson and Math Center for Grade 1! PART OF THE GRADE 1 MATH VIDEO SERIES:UNIT 1: Unit 1 Ordinal NumbersUNIT 2: Place Value (Tens & Ones) - You are here!UNIT 3: Unit 2 Number Before & Predecessor THE CONCEPT: Understanding that "24" isn't just a 2 and a 4, it is 2 Tens and 4 Ones, is one of the hardest concepts for 1st Graders. This unit bridges that gap using visual learning and Base-10 block models. THE "BRIDGE" METHOD: