[{"id": 1, "type": "short_answer", "skill": "multiplication", "question": "Calculate: 8 × 11", "difficulty": "medium", "explanation": "8 groups of 11.", "needs_review": false, "correct_answer": "88"}, {"id": 2, "type": "multiple_choice", "skill": "multiplication", "options": ["77", "88", "96", "19"], "question": "What is the product of 8 and 11?", "difficulty": "easy", "explanation": "8×11=88", "needs_review": false, "correct_answer": "88"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 6", "difficulty": "medium", "explanation": "Multiply: 5×6=30", "needs_review": false, "correct_answer": "30"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 16", "difficulty": "medium", "explanation": "Multiply: 8×16=128", "needs_review": false, "correct_answer": "128"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 5", "difficulty": "medium", "explanation": "Multiply: 13×5=65", "needs_review": false, "correct_answer": "65"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 10", "difficulty": "medium", "explanation": "Multiply: 10×10=100", "needs_review": false, "correct_answer": "100"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 12", "difficulty": "medium", "explanation": "Multiply: 4×12=48", "needs_review": false, "correct_answer": "48"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 2", "difficulty": "medium", "explanation": "Multiply: 18×2=36", "needs_review": false, "correct_answer": "36"}]