[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 65 + 40", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "105"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Identity property", "Commutative 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: 13 × 8", "difficulty": "medium", "explanation": "Multiply: 13×8=104", "needs_review": false, "correct_answer": "104"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 17", "difficulty": "medium", "explanation": "Multiply: 3×17=51", "needs_review": false, "correct_answer": "51"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 14", "difficulty": "medium", "explanation": "Multiply: 4×14=56", "needs_review": false, "correct_answer": "56"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 5", "difficulty": "medium", "explanation": "Multiply: 7×5=35", "needs_review": false, "correct_answer": "35"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 5", "difficulty": "medium", "explanation": "Multiply: 20×5=100", "needs_review": false, "correct_answer": "100"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 12", "difficulty": "medium", "explanation": "Multiply: 14×12=168", "needs_review": false, "correct_answer": "168"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 10", "difficulty": "medium", "explanation": "Multiply: 10×10=100", "needs_review": false, "correct_answer": "100"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 2", "difficulty": "medium", "explanation": "Multiply: 19×2=38", "needs_review": false, "correct_answer": "38"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 7", "difficulty": "medium", "explanation": "Multiply: 8×7=56", "needs_review": false, "correct_answer": "56"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 8", "difficulty": "medium", "explanation": "Multiply: 18×8=144", "needs_review": false, "correct_answer": "144"}]