[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 44 + 58", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "102"}, {"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: 19 × 16", "difficulty": "medium", "explanation": "Multiply: 19×16=304", "needs_review": false, "correct_answer": "304"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 13", "difficulty": "medium", "explanation": "Multiply: 13×13=169", "needs_review": false, "correct_answer": "169"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 2", "difficulty": "medium", "explanation": "Multiply: 2×2=4", "needs_review": false, "correct_answer": "4"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 5", "difficulty": "medium", "explanation": "Multiply: 11×5=55", "needs_review": false, "correct_answer": "55"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 13", "difficulty": "medium", "explanation": "Multiply: 17×13=221", "needs_review": false, "correct_answer": "221"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 11", "difficulty": "medium", "explanation": "Multiply: 19×11=209", "needs_review": false, "correct_answer": "209"}]