[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 53 + 65", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "118"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Distributive property", "Identity 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 × 5", "difficulty": "medium", "explanation": "Multiply: 2×5=10", "needs_review": false, "correct_answer": "10"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 4", "difficulty": "medium", "explanation": "Multiply: 14×4=56", "needs_review": false, "correct_answer": "56"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 17", "difficulty": "medium", "explanation": "Multiply: 12×17=204", "needs_review": false, "correct_answer": "204"}]