Learning Resources Base Ten Blocks Smart Pack LER 3671 (Mini Pack) blue.The BaseTen series of math learning materials from Learning Resources, loved in over 100 countries worldwide. This large-capacity pack contains 121 BaseTen pieces. By combining three types of pieces (units, rods, and flats), it helps children understand math. Even problems that are difficult to understand on paper, such as calculation formulas, become easier to grasp by looking at, touching, and actually using BaseTen. Let's