1. The problem is to find the ones place digit of the sum for each vertical addition group. 2. To find the ones place digit, we only need to add the digits in the ones place of each number in the column and then find the ones place of the result. 3. For example, in the first group (1234, 2343, 3451, +1432), the ones digits are 4, 3, 1, and 2. 4. Add these ones digits: $4 + 3 + 1 + 2 = 10$. 5. The ones place digit of 10 is 0, so the ones place of the sum is 0. 6. Repeat this process for each column in all groups. 7. This method works because the ones place of a sum depends only on the ones place digits of the addends. 8. This is a quick way to check or determine the ones place without adding the entire numbers. q_count is 1 because this is one type of problem repeated multiple times.