[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 41 + 15", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "56"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Distributive property", "Identity property", "Associative property", "Commutative property"], "question": "Which property states a+0=a?", "difficulty": "easy", "explanation": "The identity property of addition states that adding 0 to any number gives that number.", "needs_review": false, "correct_answer": "Identity property"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 17", "difficulty": "medium", "explanation": "Multiply: 13×17=221", "needs_review": false, "correct_answer": "221"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 11", "difficulty": "medium", "explanation": "Multiply: 14×11=154", "needs_review": false, "correct_answer": "154"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 3", "difficulty": "medium", "explanation": "Multiply: 20×3=60", "needs_review": false, "correct_answer": "60"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 16", "difficulty": "medium", "explanation": "Multiply: 20×16=320", "needs_review": false, "correct_answer": "320"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 17", "difficulty": "medium", "explanation": "Multiply: 5×17=85", "needs_review": false, "correct_answer": "85"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 9", "difficulty": "medium", "explanation": "Multiply: 10×9=90", "needs_review": false, "correct_answer": "90"}]