[{"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 = 14", "x = 4", "x = 8"], "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: 14 × 13", "difficulty": "medium", "explanation": "Multiply: 14×13=182", "needs_review": false, "correct_answer": "182"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 4", "difficulty": "medium", "explanation": "Multiply: 17×4=68", "needs_review": false, "correct_answer": "68"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 3", "difficulty": "medium", "explanation": "Multiply: 5×3=15", "needs_review": false, "correct_answer": "15"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 20", "difficulty": "medium", "explanation": "Multiply: 12×20=240", "needs_review": false, "correct_answer": "240"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 6", "difficulty": "medium", "explanation": "Multiply: 4×6=24", "needs_review": false, "correct_answer": "24"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 16", "difficulty": "medium", "explanation": "Multiply: 12×16=192", "needs_review": false, "correct_answer": "192"}]