[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 73 + 35", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "108"}, {"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: 3 × 12", "difficulty": "medium", "explanation": "Multiply: 3×12=36", "needs_review": false, "correct_answer": "36"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 11", "difficulty": "medium", "explanation": "Multiply: 14×11=154", "needs_review": false, "correct_answer": "154"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 10", "difficulty": "medium", "explanation": "Multiply: 3×10=30", "needs_review": false, "correct_answer": "30"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 11", "difficulty": "medium", "explanation": "Multiply: 6×11=66", "needs_review": false, "correct_answer": "66"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 4", "difficulty": "medium", "explanation": "Multiply: 20×4=80", "needs_review": false, "correct_answer": "80"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 9", "difficulty": "medium", "explanation": "Multiply: 10×9=90", "needs_review": false, "correct_answer": "90"}]