[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 94 + 89", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "183"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Commutative property", "Distributive 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 × 17", "difficulty": "medium", "explanation": "Multiply: 11×17=187", "needs_review": false, "correct_answer": "187"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 10", "difficulty": "medium", "explanation": "Multiply: 4×10=40", "needs_review": false, "correct_answer": "40"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 13", "difficulty": "medium", "explanation": "Multiply: 7×13=91", "needs_review": false, "correct_answer": "91"}]