[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 25 + 94", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "119"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Associative 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: 8 × 11", "difficulty": "medium", "explanation": "Multiply: 8×11=88", "needs_review": false, "correct_answer": "88"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 15", "difficulty": "medium", "explanation": "Multiply: 13×15=195", "needs_review": false, "correct_answer": "195"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 20", "difficulty": "medium", "explanation": "Multiply: 20×20=400", "needs_review": false, "correct_answer": "400"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 3", "difficulty": "medium", "explanation": "Multiply: 10×3=30", "needs_review": false, "correct_answer": "30"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 12", "difficulty": "medium", "explanation": "Multiply: 10×12=120", "needs_review": false, "correct_answer": "120"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 8", "difficulty": "medium", "explanation": "Multiply: 9×8=72", "needs_review": false, "correct_answer": "72"}]