[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 97 + 97", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "194"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Distributive property", "Associative property", "Commutative 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: 8 × 4", "difficulty": "medium", "explanation": "Multiply: 8×4=32", "needs_review": false, "correct_answer": "32"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 17", "difficulty": "medium", "explanation": "Multiply: 3×17=51", "needs_review": false, "correct_answer": "51"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 7", "difficulty": "medium", "explanation": "Multiply: 20×7=140", "needs_review": false, "correct_answer": "140"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 19", "difficulty": "medium", "explanation": "Multiply: 17×19=323", "needs_review": false, "correct_answer": "323"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 5", "difficulty": "medium", "explanation": "Multiply: 3×5=15", "needs_review": false, "correct_answer": "15"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 14", "difficulty": "medium", "explanation": "Multiply: 18×14=252", "needs_review": false, "correct_answer": "252"}]