[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 65 + 70", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "135"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Commutative property", "Distributive property", "Identity 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: 10 × 5", "difficulty": "medium", "explanation": "Multiply: 10×5=50", "needs_review": false, "correct_answer": "50"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 7", "difficulty": "medium", "explanation": "Multiply: 12×7=84", "needs_review": false, "correct_answer": "84"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 11", "difficulty": "medium", "explanation": "Multiply: 5×11=55", "needs_review": false, "correct_answer": "55"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 4", "difficulty": "medium", "explanation": "Multiply: 10×4=40", "needs_review": false, "correct_answer": "40"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 14", "difficulty": "medium", "explanation": "Multiply: 14×14=196", "needs_review": false, "correct_answer": "196"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 7", "difficulty": "medium", "explanation": "Multiply: 8×7=56", "needs_review": false, "correct_answer": "56"}]