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.
Communicate understanding that repeated subtraction is a subtraction of equal groups from a number (e.g., 15 - 5 - 5 - 5). Represent repeated subtraction using equations (e.g., 15 - 5 - 5 - 5 = 0). Solve repeated subtraction problems by identifying the number of times a number is subtracted repeatedly from another number to reach zero.
Show understanding of division by arranging the total number of objects into two or more equal groups and communicate that the total number of objects (i.e., dividend) divided by the number of groups (i.e., divisor) is equal to the number of objects in each group (i.e., quotient).
Divide numbers within 100 by 1, 2, 3, 4, 5, and 10 and determine the quotient, using manipulatives.
Recognize the inverse relationship between multiplication and division, and communicate understanding that the number of groups multiplied by the number of objects in each group equals the total number of objects and that the total number of objects divided by the number of groups equals the number of objects in each group.