[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=11, width=3", "difficulty": "medium", "explanation": "A=l×w=11×3=33 sq units.", "needs_review": false, "correct_answer": "33"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["44", "14", "33", "28"], "question": "Find the perimeter of a rectangle: length=11, width=3", "difficulty": "medium", "explanation": "P=2(l+w)=2(11+3)=2(14)=28", "needs_review": false, "correct_answer": "28"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 4", "difficulty": "medium", "explanation": "Multiply: 9×4=36", "needs_review": false, "correct_answer": "36"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 10", "difficulty": "medium", "explanation": "Multiply: 15×10=150", "needs_review": false, "correct_answer": "150"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 2", "difficulty": "medium", "explanation": "Multiply: 16×2=32", "needs_review": false, "correct_answer": "32"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 15", "difficulty": "medium", "explanation": "Multiply: 8×15=120", "needs_review": false, "correct_answer": "120"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 3", "difficulty": "medium", "explanation": "Multiply: 15×3=45", "needs_review": false, "correct_answer": "45"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 11", "difficulty": "medium", "explanation": "Multiply: 8×11=88", "needs_review": false, "correct_answer": "88"}]