These 60 standards-aligned lessons help students master the fundamentals of counting, quantity, cardinality, and more. This ready-to-use class set is built around 7 different number routines; the repeatable, low-prep activities focus on teaching the “why” and providing meaningful practice. Students build Numberblocks One to Ten, or swap cubes to build any Numberblock from Eleven to Twenty. Size: 26.9 x 39.4 x 24.1 cm. Ages 4 to 5.