[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=7, width=7", "difficulty": "medium", "explanation": "A=l×w=7×7=49 sq units.", "needs_review": false, "correct_answer": "49"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["49", "14", "28", "28"], "question": "Find the perimeter of a rectangle: length=7, width=7", "difficulty": "medium", "explanation": "P=2(l+w)=2(7+7)=2(14)=28", "needs_review": false, "correct_answer": "28"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 10", "difficulty": "medium", "explanation": "Multiply: 8×10=80", "needs_review": false, "correct_answer": "80"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 14", "difficulty": "medium", "explanation": "Multiply: 16×14=224", "needs_review": false, "correct_answer": "224"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 19", "difficulty": "medium", "explanation": "Multiply: 15×19=285", "needs_review": false, "correct_answer": "285"}]