[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 76 + 46", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "122"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Associative property", "Commutative property", "Distributive 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: 17 × 20", "difficulty": "medium", "explanation": "Multiply: 17×20=340", "needs_review": false, "correct_answer": "340"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 7", "difficulty": "medium", "explanation": "Multiply: 12×7=84", "needs_review": false, "correct_answer": "84"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 6", "difficulty": "medium", "explanation": "Multiply: 8×6=48", "needs_review": false, "correct_answer": "48"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 16", "difficulty": "medium", "explanation": "Multiply: 14×16=224", "needs_review": false, "correct_answer": "224"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 2", "difficulty": "medium", "explanation": "Multiply: 20×2=40", "needs_review": false, "correct_answer": "40"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 15", "difficulty": "medium", "explanation": "Multiply: 19×15=285", "needs_review": false, "correct_answer": "285"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 9", "difficulty": "medium", "explanation": "Multiply: 8×9=72", "needs_review": false, "correct_answer": "72"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 6", "difficulty": "medium", "explanation": "Multiply: 19×6=114", "needs_review": false, "correct_answer": "114"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 13", "difficulty": "medium", "explanation": "Multiply: 4×13=52", "needs_review": false, "correct_answer": "52"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 11", "difficulty": "medium", "explanation": "Multiply: 15×11=165", "needs_review": false, "correct_answer": "165"}]