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?
How many books do the children have at first? ** At first, the children have 10*7=<<10*7=70>>70 books
How many books are in the classroom altogether? ** With their teacher, they have 70+8=<<70+8=78>>78 books
#### 78