[{"title": "Basic Addition", "content": "Add 90 + 50. Start in the ones place: 0 + 0 = 0. Write 0. Continue to the tens place.", "solution": "90 + 50 = 140"}, {"title": "Word Problem", "content": "A library has 660 fiction books and 256 nonfiction books. How many books does the library have in total? Identify the operation: we are combining two quantities, so we add.", "solution": "660 + 256 = 916 books"}]