Base Ten Blocks are a hands-on mathematical tool used to teach basic arithmetic concepts, particularly in the base ten number system. They consist of three types of blocks: unit cubes, rods, and flats. Each unit cube represents one, each rod represents ten, and each flat represents one hundred. This visual representation helps students understand place value and how numbers are built. Teachers often use Base Ten Blocks to demonstrate addition, subtraction, and even multiplication. By physically manipulating the blocks, students can see how numbers combine or break apart, making abstract concepts more concrete and easier to grasp.