Grade 4 addition

In a marathon, 7,215 runners finished the race on Saturday, and 6,389 runners finished on Sunday. How many runners finished in both days?

The population of Town A is 345 people, and the population of Town B is 764 people. What is the total population of both towns?

The library has 4,562 fiction books and 3,128 non-fiction books. How many books are there altogether?

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