[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 53 + 41", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "94"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Identity property", "Commutative property", "Distributive 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: 11 × 5", "difficulty": "medium", "explanation": "Multiply: 11×5=55", "needs_review": false, "correct_answer": "55"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 2", "difficulty": "medium", "explanation": "Multiply: 5×2=10", "needs_review": false, "correct_answer": "10"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 13", "difficulty": "medium", "explanation": "Multiply: 11×13=143", "needs_review": false, "correct_answer": "143"}]