[{"id": 1, "type": "short_answer", "skill": "multiplication", "question": "Calculate: 8 × 12", "difficulty": "medium", "explanation": "8 groups of 12.", "needs_review": false, "correct_answer": "96"}, {"id": 2, "type": "multiple_choice", "skill": "multiplication", "options": ["104", "20", "96", "84"], "question": "What is the product of 8 and 12?", "difficulty": "easy", "explanation": "8×12=96", "needs_review": false, "correct_answer": "96"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 15", "difficulty": "medium", "explanation": "Multiply: 6×15=90", "needs_review": false, "correct_answer": "90"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 15", "difficulty": "medium", "explanation": "Multiply: 3×15=45", "needs_review": false, "correct_answer": "45"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 16", "difficulty": "medium", "explanation": "Multiply: 11×16=176", "needs_review": false, "correct_answer": "176"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 16", "difficulty": "medium", "explanation": "Multiply: 10×16=160", "needs_review": false, "correct_answer": "160"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 18", "difficulty": "medium", "explanation": "Multiply: 6×18=108", "needs_review": false, "correct_answer": "108"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 20", "difficulty": "medium", "explanation": "Multiply: 2×20=40", "needs_review": false, "correct_answer": "40"}]