[{"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 = 4", "x = 32", "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: 4 × 19", "difficulty": "medium", "explanation": "Multiply: 4×19=76", "needs_review": false, "correct_answer": "76"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 18", "difficulty": "medium", "explanation": "Multiply: 2×18=36", "needs_review": false, "correct_answer": "36"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 4", "difficulty": "medium", "explanation": "Multiply: 20×4=80", "needs_review": false, "correct_answer": "80"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 16", "difficulty": "medium", "explanation": "Multiply: 4×16=64", "needs_review": false, "correct_answer": "64"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 2", "difficulty": "medium", "explanation": "Multiply: 18×2=36", "needs_review": false, "correct_answer": "36"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 5", "difficulty": "medium", "explanation": "Multiply: 3×5=15", "needs_review": false, "correct_answer": "15"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 5", "difficulty": "medium", "explanation": "Multiply: 5×5=25", "needs_review": false, "correct_answer": "25"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 15", "difficulty": "medium", "explanation": "Multiply: 3×15=45", "needs_review": false, "correct_answer": "45"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 15", "difficulty": "medium", "explanation": "Multiply: 13×15=195", "needs_review": false, "correct_answer": "195"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 18", "difficulty": "medium", "explanation": "Multiply: 10×18=180", "needs_review": false, "correct_answer": "180"}]