[{"id": 1, "type": "short_answer", "skill": "addition", "question": "Calculate: 262 + 128", "difficulty": "medium", "explanation": "Add by place value, regrouping as needed.", "needs_review": false, "correct_answer": "390"}, {"id": 2, "type": "multiple_choice", "skill": "addition", "options": ["390", "400", "389", "395"], "question": "What is the sum of 262 and 128?", "difficulty": "easy", "explanation": "262+128=390", "needs_review": false, "correct_answer": "390"}, {"id": 3, "type": "true_false", "skill": "properties", "question": "The commutative property means 262+128 = 128+262.", "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: 11 × 3", "difficulty": "medium", "explanation": "Multiply: 11×3=33", "needs_review": false, "correct_answer": "33"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 16", "difficulty": "medium", "explanation": "Multiply: 11×16=176", "needs_review": false, "correct_answer": "176"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 14", "difficulty": "medium", "explanation": "Multiply: 5×14=70", "needs_review": false, "correct_answer": "70"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 3", "difficulty": "medium", "explanation": "Multiply: 8×3=24", "needs_review": false, "correct_answer": "24"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 16", "difficulty": "medium", "explanation": "Multiply: 12×16=192", "needs_review": false, "correct_answer": "192"}]