[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 70 + 15", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "85"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Identity property", "Distributive property", "Associative 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: 15 × 14", "difficulty": "medium", "explanation": "Multiply: 15×14=210", "needs_review": false, "correct_answer": "210"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 18", "difficulty": "medium", "explanation": "Multiply: 14×18=252", "needs_review": false, "correct_answer": "252"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 2", "difficulty": "medium", "explanation": "Multiply: 18×2=36", "needs_review": false, "correct_answer": "36"}]