[{"id": 1, "type": "short_answer", "skill": "addition", "question": "Calculate: 38 + 15", "difficulty": "medium", "explanation": "Add by place value, regrouping as needed.", "needs_review": false, "correct_answer": "53"}, {"id": 2, "type": "multiple_choice", "skill": "addition", "options": ["52", "63", "53", "58"], "question": "What is the sum of 38 and 15?", "difficulty": "easy", "explanation": "38+15=53", "needs_review": false, "correct_answer": "53"}, {"id": 3, "type": "true_false", "skill": "properties", "question": "The commutative property means 38+15 = 15+38.", "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: 11 × 3", "difficulty": "medium", "explanation": "Multiply: 11×3=33", "needs_review": false, "correct_answer": "33"}]