Singapore Math: Grade 3a, Unit 1 (Part 1)

Using a step-by-step approach, Sal from Kahn Academy visually describes what a group of 10, 100, and 1,000 means. It explores the value of numbers less than 10,000. The example is easy to understand. He puts marbles in a can, and the brilliant colors make the descriptions come alive. It is the first video in a series.