Introduces the 5- and 10-bead MathRacksTM. The unit builds on children’s innate ability to subitize small amounts (1, 2, and 3) and uses it to develop the five- structure, eventually supporting children to see, for example, 5 inside of 7 and 5 inside of 8. In the second week of the unit the 10-structure is developed, first as 5+5, and then relationships between equivalent facts are explored and developed using compensation and associativity, for example, 3+7=4+6=5+5. The unit also introduces many new games that can be played throughout the year.