[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=8, width=3", "difficulty": "medium", "explanation": "A=l×w=8×3=24 sq units.", "needs_review": false, "correct_answer": "24"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["24", "22", "32", "11"], "question": "Find the perimeter of a rectangle: length=8, width=3", "difficulty": "medium", "explanation": "P=2(l+w)=2(8+3)=2(11)=22", "needs_review": false, "correct_answer": "22"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 12", "difficulty": "medium", "explanation": "Multiply: 2×12=24", "needs_review": false, "correct_answer": "24"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 12", "difficulty": "medium", "explanation": "Multiply: 8×12=96", "needs_review": false, "correct_answer": "96"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 6", "difficulty": "medium", "explanation": "Multiply: 17×6=102", "needs_review": false, "correct_answer": "102"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 17", "difficulty": "medium", "explanation": "Multiply: 3×17=51", "needs_review": false, "correct_answer": "51"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 16", "difficulty": "medium", "explanation": "Multiply: 9×16=144", "needs_review": false, "correct_answer": "144"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 8", "difficulty": "medium", "explanation": "Multiply: 20×8=160", "needs_review": false, "correct_answer": "160"}]