[{"id": 1, "type": "short_answer", "skill": "addition", "question": "Calculate: 83 + 96", "difficulty": "medium", "explanation": "Add by place value, regrouping as needed.", "needs_review": false, "correct_answer": "179"}, {"id": 2, "type": "multiple_choice", "skill": "addition", "options": ["184", "178", "189", "179"], "question": "What is the sum of 83 and 96?", "difficulty": "easy", "explanation": "83+96=179", "needs_review": false, "correct_answer": "179"}, {"id": 3, "type": "true_false", "skill": "properties", "question": "The commutative property means 83+96 = 96+83.", "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: 14 × 13", "difficulty": "medium", "explanation": "Multiply: 14×13=182", "needs_review": false, "correct_answer": "182"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 4", "difficulty": "medium", "explanation": "Multiply: 5×4=20", "needs_review": false, "correct_answer": "20"}]