[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=9, width=8", "difficulty": "medium", "explanation": "A=l×w=9×8=72 sq units.", "needs_review": false, "correct_answer": "72"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["36", "72", "34", "17"], "question": "Find the perimeter of a rectangle: length=9, width=8", "difficulty": "medium", "explanation": "P=2(l+w)=2(9+8)=2(17)=34", "needs_review": false, "correct_answer": "34"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 2", "difficulty": "medium", "explanation": "Multiply: 11×2=22", "needs_review": false, "correct_answer": "22"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 18", "difficulty": "medium", "explanation": "Multiply: 10×18=180", "needs_review": false, "correct_answer": "180"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 19", "difficulty": "medium", "explanation": "Multiply: 2×19=38", "needs_review": false, "correct_answer": "38"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 19", "difficulty": "medium", "explanation": "Multiply: 11×19=209", "needs_review": false, "correct_answer": "209"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 5", "difficulty": "medium", "explanation": "Multiply: 10×5=50", "needs_review": false, "correct_answer": "50"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 3", "difficulty": "medium", "explanation": "Multiply: 3×3=9", "needs_review": false, "correct_answer": "9"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 6", "difficulty": "medium", "explanation": "Multiply: 11×6=66", "needs_review": false, "correct_answer": "66"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 5", "difficulty": "medium", "explanation": "Multiply: 16×5=80", "needs_review": false, "correct_answer": "80"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 17", "difficulty": "medium", "explanation": "Multiply: 5×17=85", "needs_review": false, "correct_answer": "85"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 7", "difficulty": "medium", "explanation": "Multiply: 12×7=84", "needs_review": false, "correct_answer": "84"}]