[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 96 + 19", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "115"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Identity property", "Distributive 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: 17 × 20", "difficulty": "medium", "explanation": "Multiply: 17×20=340", "needs_review": false, "correct_answer": "340"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 13", "difficulty": "medium", "explanation": "Multiply: 16×13=208", "needs_review": false, "correct_answer": "208"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 11", "difficulty": "medium", "explanation": "Multiply: 13×11=143", "needs_review": false, "correct_answer": "143"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 18", "difficulty": "medium", "explanation": "Multiply: 14×18=252", "needs_review": false, "correct_answer": "252"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 5", "difficulty": "medium", "explanation": "Multiply: 7×5=35", "needs_review": false, "correct_answer": "35"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 7", "difficulty": "medium", "explanation": "Multiply: 16×7=112", "needs_review": false, "correct_answer": "112"}]