[{"id": 1, "type": "short_answer", "skill": "addition", "question": "Calculate: 111 + 134", "difficulty": "medium", "explanation": "Add by place value, regrouping as needed.", "needs_review": false, "correct_answer": "245"}, {"id": 2, "type": "multiple_choice", "skill": "addition", "options": ["244", "245", "250", "255"], "question": "What is the sum of 111 and 134?", "difficulty": "easy", "explanation": "111+134=245", "needs_review": false, "correct_answer": "245"}, {"id": 3, "type": "true_false", "skill": "properties", "question": "The commutative property means 111+134 = 134+111.", "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: 12 × 4", "difficulty": "medium", "explanation": "Multiply: 12×4=48", "needs_review": false, "correct_answer": "48"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 18", "difficulty": "medium", "explanation": "Multiply: 2×18=36", "needs_review": false, "correct_answer": "36"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 7", "difficulty": "medium", "explanation": "Multiply: 2×7=14", "needs_review": false, "correct_answer": "14"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 2", "difficulty": "medium", "explanation": "Multiply: 10×2=20", "needs_review": false, "correct_answer": "20"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 8", "difficulty": "medium", "explanation": "Multiply: 2×8=16", "needs_review": false, "correct_answer": "16"}]