Addition and Subtraction with Regrouping

A factory produced 8,756 toys in January and 9,845 toys in February. How many toys did the factory produce in all?

In a fun run, there were 6,478 participants from City A and 7,956 participants from City B. How many participants joined in total?

A bookstore sold 5,689 books in the first week and 8,734 books in the second week. How many books did the store sell in two weeks?

A farmer harvested 9,672 kilograms of rice from one field and 8,458 kilograms from another field. How many kilograms of rice did he harvest altogether?

During a school drive, students collected 7,849 plastic bottles in September and 9,678 bottles in October. How many bottles did they collect in all?

A factory made 9,864 chocolate bars in a week. If 7,539 chocolate bars were sold, how many chocolate bars are left?

There were 8,750 students who joined the school fun run. After the event, only 6,982 received medals. How many students did not receive medals?

A farmer harvested 9,406 mangoes. He sold 7,895 of them at the market. How many mangoes were left?

A bookstore had 7,845 books in stock. After a big sale, only 5,978 books remained. How many books were sold?

The city library had 10,000 books last year. This year, there are 8,657 books left after some were damaged. How many books were damaged?