[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 26 + 37", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "63"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Commutative property", "Distributive property", "Identity 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: 3 × 10", "difficulty": "medium", "explanation": "Multiply: 3×10=30", "needs_review": false, "correct_answer": "30"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 5", "difficulty": "medium", "explanation": "Multiply: 12×5=60", "needs_review": false, "correct_answer": "60"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 6", "difficulty": "medium", "explanation": "Multiply: 7×6=42", "needs_review": false, "correct_answer": "42"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 17", "difficulty": "medium", "explanation": "Multiply: 19×17=323", "needs_review": false, "correct_answer": "323"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 16", "difficulty": "medium", "explanation": "Multiply: 12×16=192", "needs_review": false, "correct_answer": "192"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 12", "difficulty": "medium", "explanation": "Multiply: 8×12=96", "needs_review": false, "correct_answer": "96"}]