[{"id": 1, "type": "short_answer", "skill": "equations", "question": "Solve: 3x + 7 = 22", "difficulty": "medium", "explanation": "Subtract 7: 3x=15. Divide by 3: x=5. Check: 3(5)+7=22 ✓", "needs_review": false, "correct_answer": "x = 5"}, {"id": 2, "type": "multiple_choice", "skill": "equations", "options": ["x = 32", "x = 4", "x = 8", "x = 14"], "question": "Solve: 2x = 16", "difficulty": "easy", "explanation": "Divide both sides by 2: x=16/2=8.", "needs_review": false, "correct_answer": "x = 8"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 12", "difficulty": "medium", "explanation": "Multiply: 15×12=180", "needs_review": false, "correct_answer": "180"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 9", "difficulty": "medium", "explanation": "Multiply: 2×9=18", "needs_review": false, "correct_answer": "18"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 11", "difficulty": "medium", "explanation": "Multiply: 14×11=154", "needs_review": false, "correct_answer": "154"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 6", "difficulty": "medium", "explanation": "Multiply: 9×6=54", "needs_review": false, "correct_answer": "54"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 5", "difficulty": "medium", "explanation": "Multiply: 13×5=65", "needs_review": false, "correct_answer": "65"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 10", "difficulty": "medium", "explanation": "Multiply: 17×10=170", "needs_review": false, "correct_answer": "170"}]