[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 95 + 60", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "155"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Distributive property", "Commutative property", "Associative 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: 11 × 14", "difficulty": "medium", "explanation": "Multiply: 11×14=154", "needs_review": false, "correct_answer": "154"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 3", "difficulty": "medium", "explanation": "Multiply: 13×3=39", "needs_review": false, "correct_answer": "39"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 9", "difficulty": "medium", "explanation": "Multiply: 13×9=117", "needs_review": false, "correct_answer": "117"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 8", "difficulty": "medium", "explanation": "Multiply: 17×8=136", "needs_review": false, "correct_answer": "136"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 15", "difficulty": "medium", "explanation": "Multiply: 9×15=135", "needs_review": false, "correct_answer": "135"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 15", "difficulty": "medium", "explanation": "Multiply: 16×15=240", "needs_review": false, "correct_answer": "240"}]