[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 76 + 72", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "148"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Distributive property", "Associative property", "Commutative property"], "question": "Which property states a+0=a?", "difficulty": "easy", "explanation": "The identity property of addition states that adding 0 to any number gives that number.", "needs_review": false, "correct_answer": "Identity property"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 6", "difficulty": "medium", "explanation": "Multiply: 7×6=42", "needs_review": false, "correct_answer": "42"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 11", "difficulty": "medium", "explanation": "Multiply: 7×11=77", "needs_review": false, "correct_answer": "77"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 13", "difficulty": "medium", "explanation": "Multiply: 18×13=234", "needs_review": false, "correct_answer": "234"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 7", "difficulty": "medium", "explanation": "Multiply: 16×7=112", "needs_review": false, "correct_answer": "112"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 19", "difficulty": "medium", "explanation": "Multiply: 9×19=171", "needs_review": false, "correct_answer": "171"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 3", "difficulty": "medium", "explanation": "Multiply: 9×3=27", "needs_review": false, "correct_answer": "27"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 3", "difficulty": "medium", "explanation": "Multiply: 5×3=15", "needs_review": false, "correct_answer": "15"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 17", "difficulty": "medium", "explanation": "Multiply: 6×17=102", "needs_review": false, "correct_answer": "102"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 15", "difficulty": "medium", "explanation": "Multiply: 14×15=210", "needs_review": false, "correct_answer": "210"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 19", "difficulty": "medium", "explanation": "Multiply: 20×19=380", "needs_review": false, "correct_answer": "380"}]