[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 80 + 75", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "155"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Distributive property", "Commutative property", "Identity property", "Associative 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: 2 × 18", "difficulty": "medium", "explanation": "Multiply: 2×18=36", "needs_review": false, "correct_answer": "36"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 13", "difficulty": "medium", "explanation": "Multiply: 8×13=104", "needs_review": false, "correct_answer": "104"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 10", "difficulty": "medium", "explanation": "Multiply: 6×10=60", "needs_review": false, "correct_answer": "60"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 3", "difficulty": "medium", "explanation": "Multiply: 7×3=21", "needs_review": false, "correct_answer": "21"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 11", "difficulty": "medium", "explanation": "Multiply: 8×11=88", "needs_review": false, "correct_answer": "88"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 12", "difficulty": "medium", "explanation": "Multiply: 16×12=192", "needs_review": false, "correct_answer": "192"}]