1. The problem is to understand the developmental stages in addition. 2. Addition is a fundamental arithmetic operation where two or more numbers are combined to get a total or sum. 3. Developmental stages in addition typically refer to how children learn and progress in their ability to add numbers. 4. The stages often include: - **Counting all:** The child counts all objects in both groups to find the total. - **Counting on:** The child starts with the larger number and counts up the smaller number. - **Decomposition:** The child breaks numbers into parts to make addition easier (e.g., 8 + 5 as 8 + 2 + 3). - **Using known facts:** The child recalls addition facts from memory (e.g., 5 + 5 = 10). 5. Each stage builds on the previous one, improving efficiency and understanding. 6. Understanding these stages helps educators tailor teaching methods to the child's current level.