A farmer harvested 356 apples on Monday and 289 apples on Tuesday. How many apples did the farmer harvest in total?

If a book costs $$245\ and\ a\ pen\ \cos ts$$ 78, how much more does the book cost than the pen?

Tom has 432 stickers. He gave 156 stickers to his brother and 78 stickers to his friend. How many stickers does Tom have left?

A school has 567 students. If 234 students are girls, how many boys are there in the school?

A library had 789 books. After donating some books, there are 456 books left. How many books were donated?

A toy store sold 123 toys on Monday, 145 toys on Tuesday, and 167 toys on Wednesday. How many toys did the store sell in total over these three days?

A baker made 456 cookies. He sold 289 cookies and gave away 67 cookies. How many cookies does he have left?

A train travels 345 miles on the first day and 278 miles on the second day. How many more miles does the train need to travel to reach a total of 800 miles?

A factory produced 678 gadgets in January and 543 gadgets in February. How many more gadgets need to be produced in March to reach a total of 2000 gadgets?