[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=7, width=5", "difficulty": "medium", "explanation": "A=l×w=7×5=35 sq units.", "needs_review": false, "correct_answer": "35"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["12", "28", "24", "35"], "question": "Find the perimeter of a rectangle: length=7, width=5", "difficulty": "medium", "explanation": "P=2(l+w)=2(7+5)=2(12)=24", "needs_review": false, "correct_answer": "24"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 6", "difficulty": "medium", "explanation": "Multiply: 16×6=96", "needs_review": false, "correct_answer": "96"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 5", "difficulty": "medium", "explanation": "Multiply: 5×5=25", "needs_review": false, "correct_answer": "25"}, {"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: 8 × 6", "difficulty": "medium", "explanation": "Multiply: 8×6=48", "needs_review": false, "correct_answer": "48"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 17", "difficulty": "medium", "explanation": "Multiply: 5×17=85", "needs_review": false, "correct_answer": "85"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 10", "difficulty": "medium", "explanation": "Multiply: 17×10=170", "needs_review": false, "correct_answer": "170"}]