[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 88 + 67", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "155"}, {"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: 5 × 2", "difficulty": "medium", "explanation": "Multiply: 5×2=10", "needs_review": false, "correct_answer": "10"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 7", "difficulty": "medium", "explanation": "Multiply: 2×7=14", "needs_review": false, "correct_answer": "14"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 17", "difficulty": "medium", "explanation": "Multiply: 14×17=238", "needs_review": false, "correct_answer": "238"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 18", "difficulty": "medium", "explanation": "Multiply: 9×18=162", "needs_review": false, "correct_answer": "162"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 12", "difficulty": "medium", "explanation": "Multiply: 14×12=168", "needs_review": false, "correct_answer": "168"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 20", "difficulty": "medium", "explanation": "Multiply: 2×20=40", "needs_review": false, "correct_answer": "40"}]