[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 97 + 88", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "185"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Associative 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: 12 × 20", "difficulty": "medium", "explanation": "Multiply: 12×20=240", "needs_review": false, "correct_answer": "240"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 3", "difficulty": "medium", "explanation": "Multiply: 9×3=27", "needs_review": false, "correct_answer": "27"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 18", "difficulty": "medium", "explanation": "Multiply: 5×18=90", "needs_review": false, "correct_answer": "90"}]