[{"id": 1, "type": "short_answer", "skill": "multiplication", "question": "Calculate: 5 × 10", "difficulty": "medium", "explanation": "5 groups of 10.", "needs_review": false, "correct_answer": "50"}, {"id": 2, "type": "multiple_choice", "skill": "multiplication", "options": ["55", "40", "50", "15"], "question": "What is the product of 5 and 10?", "difficulty": "easy", "explanation": "5×10=50", "needs_review": false, "correct_answer": "50"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 2", "difficulty": "medium", "explanation": "Multiply: 18×2=36", "needs_review": false, "correct_answer": "36"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 18", "difficulty": "medium", "explanation": "Multiply: 19×18=342", "needs_review": false, "correct_answer": "342"}, {"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: 16 × 3", "difficulty": "medium", "explanation": "Multiply: 16×3=48", "needs_review": false, "correct_answer": "48"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 17", "difficulty": "medium", "explanation": "Multiply: 7×17=119", "needs_review": false, "correct_answer": "119"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 3", "difficulty": "medium", "explanation": "Multiply: 19×3=57", "needs_review": false, "correct_answer": "57"}]