Give the step-by-step reasoning process and then the final answer. In a classroom, 10 children have 7 books each. Their teacher brings another 8 books to the classroom. How many books are in the classroom altogether?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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At first, the children have 10 * 7 = 70 books. With their teacher, they have 70 + 8 = 78 books.
The final answer: 78.