[{"title": "Basic Addition", "content": "Add 23 + 74. Start in the ones place: 3 + 4 = 7. Write 7. Continue to the tens place.", "solution": "23 + 74 = 97"}, {"title": "Word Problem", "content": "A library has 168 fiction books and 268 nonfiction books. How many books does the library have in total? Identify the operation: we are combining two quantities, so we add.", "solution": "168 + 268 = 436 books"}]