1. The problem is to add a series of numbers step-by-step until reaching the final sum. 2. The formula for adding numbers is simply summing each term: $$S = a_1 + a_2 + a_3 + \cdots + a_n$$ where $a_i$ are the terms. 3. Important rule: addition is associative and commutative, so you can add in any order. 4. Start by adding the first two numbers: $$S_2 = a_1 + a_2$$ 5. Then add the next number to the current sum: $$S_3 = S_2 + a_3$$ 6. Continue this process until all numbers are added: $$S_n = S_{n-1} + a_n$$ 7. This stepwise addition helps avoid mistakes and keeps track of intermediate sums. 8. The final answer is the total sum after adding all terms. If you provide the specific numbers or terms, I can demonstrate the stepwise addition explicitly.