1. The problem is to calculate the sum of the two numbers: $100 + 108393981830179174628$. 2. Start by aligning the numbers: $\quad\quad 100$ $+108393981830179174628$ 3. Adding $100$ to $108393981830179174628$ means increasing the last three digits by 100, which affects only the last three digits. 4. The addition is straightforward because $100$ is much smaller than $108393981830179174628$. 5. The final sum is: $$108393981830179174728$$ This is the total when you add $100$ to $108393981830179174628$.