[{"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 = 8", "x = 14", "x = 4"], "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: 12 × 16", "difficulty": "medium", "explanation": "Multiply: 12×16=192", "needs_review": false, "correct_answer": "192"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 7", "difficulty": "medium", "explanation": "Multiply: 7×7=49", "needs_review": false, "correct_answer": "49"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 16", "difficulty": "medium", "explanation": "Multiply: 18×16=288", "needs_review": false, "correct_answer": "288"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 15", "difficulty": "medium", "explanation": "Multiply: 7×15=105", "needs_review": false, "correct_answer": "105"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 18", "difficulty": "medium", "explanation": "Multiply: 19×18=342", "needs_review": false, "correct_answer": "342"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 4", "difficulty": "medium", "explanation": "Multiply: 19×4=76", "needs_review": false, "correct_answer": "76"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 16", "difficulty": "medium", "explanation": "Multiply: 7×16=112", "needs_review": false, "correct_answer": "112"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 19", "difficulty": "medium", "explanation": "Multiply: 17×19=323", "needs_review": false, "correct_answer": "323"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 16", "difficulty": "medium", "explanation": "Multiply: 20×16=320", "needs_review": false, "correct_answer": "320"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 7", "difficulty": "medium", "explanation": "Multiply: 17×7=119", "needs_review": false, "correct_answer": "119"}]