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.
ets of objects to create a new set. Divide a set of 10 or fewer objects into two or more distinct subsets. Count all objects in a set to communicate the total number of objects in a set.
Add two numbers with a sum within 20 using objects, drawings, counters, or a mathematical equation, and communicate the sum by combining both the numbers. Subtract a smaller number from a larger number (no larger than 20) by taking counters/objects away from the larger set or using drawings or a mathematical equation, and communicate the left-over number as the difference.
Demonstrate addition by adding two numbers up to 100. Demonstrate subtraction by subtracting numbers up to 100. Use place-value reasoning including multiples of 10 and 100 to add or subtract numbers.
Use addition and subtraction within 100 to solve word problems, including join, separate, part-part-whole, and compare problems.