[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 73 + 26", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "99"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Commutative property", "Associative property", "Distributive 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: 5 × 6", "difficulty": "medium", "explanation": "Multiply: 5×6=30", "needs_review": false, "correct_answer": "30"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 6", "difficulty": "medium", "explanation": "Multiply: 19×6=114", "needs_review": false, "correct_answer": "114"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 6", "difficulty": "medium", "explanation": "Multiply: 13×6=78", "needs_review": false, "correct_answer": "78"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 6", "difficulty": "medium", "explanation": "Multiply: 19×6=114", "needs_review": false, "correct_answer": "114"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 10", "difficulty": "medium", "explanation": "Multiply: 2×10=20", "needs_review": false, "correct_answer": "20"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 2", "difficulty": "medium", "explanation": "Multiply: 2×2=4", "needs_review": false, "correct_answer": "4"}]