[{"id": 1, "type": "short_answer", "skill": "addition", "question": "Calculate: 71 + 48", "difficulty": "medium", "explanation": "Add by place value, regrouping as needed.", "needs_review": false, "correct_answer": "119"}, {"id": 2, "type": "multiple_choice", "skill": "addition", "options": ["129", "119", "124", "118"], "question": "What is the sum of 71 and 48?", "difficulty": "easy", "explanation": "71+48=119", "needs_review": false, "correct_answer": "119"}, {"id": 3, "type": "true_false", "skill": "properties", "question": "The commutative property means 71+48 = 48+71.", "difficulty": "easy", "explanation": "The commutative property states changing the order of addends does not change the sum.", "needs_review": false, "correct_answer": "True"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 14", "difficulty": "medium", "explanation": "Multiply: 13×14=182", "needs_review": false, "correct_answer": "182"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 17", "difficulty": "medium", "explanation": "Multiply: 7×17=119", "needs_review": false, "correct_answer": "119"}]