[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 43 + 88", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "131"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Associative property", "Distributive property", "Commutative 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: 2 × 2", "difficulty": "medium", "explanation": "Multiply: 2×2=4", "needs_review": false, "correct_answer": "4"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 11", "difficulty": "medium", "explanation": "Multiply: 15×11=165", "needs_review": false, "correct_answer": "165"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 2", "difficulty": "medium", "explanation": "Multiply: 6×2=12", "needs_review": false, "correct_answer": "12"}]