[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 56 + 97", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "153"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Distributive property", "Associative property", "Commutative property", "Identity 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 × 12", "difficulty": "medium", "explanation": "Multiply: 2×12=24", "needs_review": false, "correct_answer": "24"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 11", "difficulty": "medium", "explanation": "Multiply: 2×11=22", "needs_review": false, "correct_answer": "22"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 4", "difficulty": "medium", "explanation": "Multiply: 20×4=80", "needs_review": false, "correct_answer": "80"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 12", "difficulty": "medium", "explanation": "Multiply: 15×12=180", "needs_review": false, "correct_answer": "180"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 9", "difficulty": "medium", "explanation": "Multiply: 7×9=63", "needs_review": false, "correct_answer": "63"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 10", "difficulty": "medium", "explanation": "Multiply: 5×10=50", "needs_review": false, "correct_answer": "50"}]