This is aligned with the following California State Standards:
Communicate understanding of separateness by recognizing objects that are not joined together. Communicate understanding of set by recognizing a group of objects sharing an attribute. Communicate understanding of a subset by recognizing a subset as a set or group of objects within a larger set that share an attribute.
Recognize two sets that contain the same number of objects, and name those sets as equal sets. Communicate understanding that same amount means equal. Create a set that contains the same number of objects as the given set.
Divide a set containing 10 or fewer objects into equal subsets (e.g., divide a set consisting of 10 counters into two subsets with 5 counters each).
Divide a set containing 10 or fewer objects into equal subsets (e.g., divide a set consisting of 10 counters into two subsets with 5 counters each).
Communicate understanding of division as total number of objects (i.e., dividend) divided by number of groups (i.e., divisor) equals number of objects in each group (i.e., quotient) (e.g., 20/5 = 4). Understand that division is similar to repeated subtraction, where a single number (i.e., divisor) is subtracted repeatedly from a given number (i.e., dividend) and the quotient equals the number of times the number is subtracted (e.g., 20/5 = 20 - 5 - 5 - 5 - 5 = 0; thus, the quotient = 4).