[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 + 41", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "57"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Distributive property", "Commutative property", "Identity 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: 14 × 14", "difficulty": "medium", "explanation": "Multiply: 14×14=196", "needs_review": false, "correct_answer": "196"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 4", "difficulty": "medium", "explanation": "Multiply: 6×4=24", "needs_review": false, "correct_answer": "24"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 9", "difficulty": "medium", "explanation": "Multiply: 14×9=126", "needs_review": false, "correct_answer": "126"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 6", "difficulty": "medium", "explanation": "Multiply: 5×6=30", "needs_review": false, "correct_answer": "30"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 9", "difficulty": "medium", "explanation": "Multiply: 13×9=117", "needs_review": false, "correct_answer": "117"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 18", "difficulty": "medium", "explanation": "Multiply: 6×18=108", "needs_review": false, "correct_answer": "108"}]