[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 56 + 11", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "67"}, {"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: 11 × 8", "difficulty": "medium", "explanation": "Multiply: 11×8=88", "needs_review": false, "correct_answer": "88"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 17", "difficulty": "medium", "explanation": "Multiply: 7×17=119", "needs_review": false, "correct_answer": "119"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 4", "difficulty": "medium", "explanation": "Multiply: 2×4=8", "needs_review": false, "correct_answer": "8"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 18", "difficulty": "medium", "explanation": "Multiply: 20×18=360", "needs_review": false, "correct_answer": "360"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 11", "difficulty": "medium", "explanation": "Multiply: 10×11=110", "needs_review": false, "correct_answer": "110"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 19", "difficulty": "medium", "explanation": "Multiply: 13×19=247", "needs_review": false, "correct_answer": "247"}]