[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 72 + 95", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "167"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Distributive property", "Associative property", "Identity 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: 9 × 12", "difficulty": "medium", "explanation": "Multiply: 9×12=108", "needs_review": false, "correct_answer": "108"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 10", "difficulty": "medium", "explanation": "Multiply: 6×10=60", "needs_review": false, "correct_answer": "60"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 9", "difficulty": "medium", "explanation": "Multiply: 13×9=117", "needs_review": false, "correct_answer": "117"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 10", "difficulty": "medium", "explanation": "Multiply: 19×10=190", "needs_review": false, "correct_answer": "190"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 14", "difficulty": "medium", "explanation": "Multiply: 18×14=252", "needs_review": false, "correct_answer": "252"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 8", "difficulty": "medium", "explanation": "Multiply: 2×8=16", "needs_review": false, "correct_answer": "16"}]