[{"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", "17", "34", "72"], "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: 2 × 12", "difficulty": "medium", "explanation": "Multiply: 2×12=24", "needs_review": false, "correct_answer": "24"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 8", "difficulty": "medium", "explanation": "Multiply: 4×8=32", "needs_review": false, "correct_answer": "32"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 11", "difficulty": "medium", "explanation": "Multiply: 8×11=88", "needs_review": false, "correct_answer": "88"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 7", "difficulty": "medium", "explanation": "Multiply: 6×7=42", "needs_review": false, "correct_answer": "42"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 15", "difficulty": "medium", "explanation": "Multiply: 3×15=45", "needs_review": false, "correct_answer": "45"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 17", "difficulty": "medium", "explanation": "Multiply: 15×17=255", "needs_review": false, "correct_answer": "255"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 16", "difficulty": "medium", "explanation": "Multiply: 2×16=32", "needs_review": false, "correct_answer": "32"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 7", "difficulty": "medium", "explanation": "Multiply: 15×7=105", "needs_review": false, "correct_answer": "105"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 14", "difficulty": "medium", "explanation": "Multiply: 17×14=238", "needs_review": false, "correct_answer": "238"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 5", "difficulty": "medium", "explanation": "Multiply: 15×5=75", "needs_review": false, "correct_answer": "75"}]