[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 35 + 97", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "132"}, {"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: 4 × 8", "difficulty": "medium", "explanation": "Multiply: 4×8=32", "needs_review": false, "correct_answer": "32"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 5", "difficulty": "medium", "explanation": "Multiply: 8×5=40", "needs_review": false, "correct_answer": "40"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 5", "difficulty": "medium", "explanation": "Multiply: 4×5=20", "needs_review": false, "correct_answer": "20"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 13", "difficulty": "medium", "explanation": "Multiply: 18×13=234", "needs_review": false, "correct_answer": "234"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 15", "difficulty": "medium", "explanation": "Multiply: 12×15=180", "needs_review": false, "correct_answer": "180"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 13", "difficulty": "medium", "explanation": "Multiply: 16×13=208", "needs_review": false, "correct_answer": "208"}]