[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 37 + 83", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "120"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Associative property", "Distributive property", "Commutative 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 × 18", "difficulty": "medium", "explanation": "Multiply: 5×18=90", "needs_review": false, "correct_answer": "90"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 18", "difficulty": "medium", "explanation": "Multiply: 7×18=126", "needs_review": false, "correct_answer": "126"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 20", "difficulty": "medium", "explanation": "Multiply: 10×20=200", "needs_review": false, "correct_answer": "200"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 3", "difficulty": "medium", "explanation": "Multiply: 7×3=21", "needs_review": false, "correct_answer": "21"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 5", "difficulty": "medium", "explanation": "Multiply: 12×5=60", "needs_review": false, "correct_answer": "60"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 13", "difficulty": "medium", "explanation": "Multiply: 3×13=39", "needs_review": false, "correct_answer": "39"}]