[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 88 + 61", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "149"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Identity property", "Commutative property", "Distributive 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: 6 × 12", "difficulty": "medium", "explanation": "Multiply: 6×12=72", "needs_review": false, "correct_answer": "72"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 13", "difficulty": "medium", "explanation": "Multiply: 7×13=91", "needs_review": false, "correct_answer": "91"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 18", "difficulty": "medium", "explanation": "Multiply: 12×18=216", "needs_review": false, "correct_answer": "216"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 8", "difficulty": "medium", "explanation": "Multiply: 13×8=104", "needs_review": false, "correct_answer": "104"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 6", "difficulty": "medium", "explanation": "Multiply: 17×6=102", "needs_review": false, "correct_answer": "102"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 10", "difficulty": "medium", "explanation": "Multiply: 5×10=50", "needs_review": false, "correct_answer": "50"}]