[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 61 + 95", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "156"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Identity property", "Distributive 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: 14 × 20", "difficulty": "medium", "explanation": "Multiply: 14×20=280", "needs_review": false, "correct_answer": "280"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 14", "difficulty": "medium", "explanation": "Multiply: 4×14=56", "needs_review": false, "correct_answer": "56"}, {"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: 13 × 15", "difficulty": "medium", "explanation": "Multiply: 13×15=195", "needs_review": false, "correct_answer": "195"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 4", "difficulty": "medium", "explanation": "Multiply: 8×4=32", "needs_review": false, "correct_answer": "32"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 14", "difficulty": "medium", "explanation": "Multiply: 20×14=280", "needs_review": false, "correct_answer": "280"}]