[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 96 + 66", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "162"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Associative property", "Identity property", "Distributive 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: 4 × 5", "difficulty": "medium", "explanation": "Multiply: 4×5=20", "needs_review": false, "correct_answer": "20"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 10", "difficulty": "medium", "explanation": "Multiply: 7×10=70", "needs_review": false, "correct_answer": "70"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 6", "difficulty": "medium", "explanation": "Multiply: 16×6=96", "needs_review": false, "correct_answer": "96"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 7", "difficulty": "medium", "explanation": "Multiply: 15×7=105", "needs_review": false, "correct_answer": "105"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 12", "difficulty": "medium", "explanation": "Multiply: 13×12=156", "needs_review": false, "correct_answer": "156"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 13", "difficulty": "medium", "explanation": "Multiply: 2×13=26", "needs_review": false, "correct_answer": "26"}]