[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 59 + 64", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "123"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Distributive property", "Associative 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: 4 × 16", "difficulty": "medium", "explanation": "Multiply: 4×16=64", "needs_review": false, "correct_answer": "64"}, {"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: 6 × 5", "difficulty": "medium", "explanation": "Multiply: 6×5=30", "needs_review": false, "correct_answer": "30"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 14", "difficulty": "medium", "explanation": "Multiply: 6×14=84", "needs_review": false, "correct_answer": "84"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 2", "difficulty": "medium", "explanation": "Multiply: 4×2=8", "needs_review": false, "correct_answer": "8"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 6", "difficulty": "medium", "explanation": "Multiply: 18×6=108", "needs_review": false, "correct_answer": "108"}]