[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 41 + 73", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "114"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Commutative property", "Distributive property", "Identity property"], "question": "Which property states a+0=a?", "difficulty": "easy", "explanation": "The identity property of addition states that adding 0 to any number gives that number.", "needs_review": false, "correct_answer": "Identity property"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 8", "difficulty": "medium", "explanation": "Multiply: 5×8=40", "needs_review": false, "correct_answer": "40"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 20", "difficulty": "medium", "explanation": "Multiply: 3×20=60", "needs_review": false, "correct_answer": "60"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 17", "difficulty": "medium", "explanation": "Multiply: 10×17=170", "needs_review": false, "correct_answer": "170"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 18", "difficulty": "medium", "explanation": "Multiply: 11×18=198", "needs_review": false, "correct_answer": "198"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 9", "difficulty": "medium", "explanation": "Multiply: 4×9=36", "needs_review": false, "correct_answer": "36"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 20", "difficulty": "medium", "explanation": "Multiply: 10×20=200", "needs_review": false, "correct_answer": "200"}]