[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 49 + 29", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "78"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Distributive property", "Identity 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: 14 × 5", "difficulty": "medium", "explanation": "Multiply: 14×5=70", "needs_review": false, "correct_answer": "70"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 2", "difficulty": "medium", "explanation": "Multiply: 15×2=30", "needs_review": false, "correct_answer": "30"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 8", "difficulty": "medium", "explanation": "Multiply: 19×8=152", "needs_review": false, "correct_answer": "152"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 2", "difficulty": "medium", "explanation": "Multiply: 19×2=38", "needs_review": false, "correct_answer": "38"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 17", "difficulty": "medium", "explanation": "Multiply: 12×17=204", "needs_review": false, "correct_answer": "204"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 11", "difficulty": "medium", "explanation": "Multiply: 14×11=154", "needs_review": false, "correct_answer": "154"}]