[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 44 + 11", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "55"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Identity property", "Commutative 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: 10 × 11", "difficulty": "medium", "explanation": "Multiply: 10×11=110", "needs_review": false, "correct_answer": "110"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 15", "difficulty": "medium", "explanation": "Multiply: 2×15=30", "needs_review": false, "correct_answer": "30"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 9", "difficulty": "medium", "explanation": "Multiply: 7×9=63", "needs_review": false, "correct_answer": "63"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 2", "difficulty": "medium", "explanation": "Multiply: 18×2=36", "needs_review": false, "correct_answer": "36"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 4", "difficulty": "medium", "explanation": "Multiply: 3×4=12", "needs_review": false, "correct_answer": "12"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 8", "difficulty": "medium", "explanation": "Multiply: 12×8=96", "needs_review": false, "correct_answer": "96"}]