[{"title": "Basic Subtraction", "content": "Subtract 60 − 17. Ones place: 0 − 7. Since 0 < 7, borrow from the tens place.", "solution": "60 − 17 = 43"}, {"title": "Checking with Addition", "content": "If 85 − 37 = 48, check by adding: 48 + 37 = 85. ✓ Correct.", "solution": "85 − 37 = 48"}]