[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 48 + 95", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "143"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Identity 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: 18 × 4", "difficulty": "medium", "explanation": "Multiply: 18×4=72", "needs_review": false, "correct_answer": "72"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 2", "difficulty": "medium", "explanation": "Multiply: 16×2=32", "needs_review": false, "correct_answer": "32"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 3", "difficulty": "medium", "explanation": "Multiply: 11×3=33", "needs_review": false, "correct_answer": "33"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 3", "difficulty": "medium", "explanation": "Multiply: 6×3=18", "needs_review": false, "correct_answer": "18"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 12", "difficulty": "medium", "explanation": "Multiply: 4×12=48", "needs_review": false, "correct_answer": "48"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 7", "difficulty": "medium", "explanation": "Multiply: 3×7=21", "needs_review": false, "correct_answer": "21"}]