[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 69 + 10", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "79"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Identity property", "Associative 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: 5 × 15", "difficulty": "medium", "explanation": "Multiply: 5×15=75", "needs_review": false, "correct_answer": "75"}, {"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: 5 × 14", "difficulty": "medium", "explanation": "Multiply: 5×14=70", "needs_review": false, "correct_answer": "70"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 11", "difficulty": "medium", "explanation": "Multiply: 15×11=165", "needs_review": false, "correct_answer": "165"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 19", "difficulty": "medium", "explanation": "Multiply: 3×19=57", "needs_review": false, "correct_answer": "57"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 10", "difficulty": "medium", "explanation": "Multiply: 3×10=30", "needs_review": false, "correct_answer": "30"}]