[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 35 + 25", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "60"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Distributive property", "Commutative 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: 11 × 7", "difficulty": "medium", "explanation": "Multiply: 11×7=77", "needs_review": false, "correct_answer": "77"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 7", "difficulty": "medium", "explanation": "Multiply: 7×7=49", "needs_review": false, "correct_answer": "49"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 6", "difficulty": "medium", "explanation": "Multiply: 10×6=60", "needs_review": false, "correct_answer": "60"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 8", "difficulty": "medium", "explanation": "Multiply: 13×8=104", "needs_review": false, "correct_answer": "104"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 18", "difficulty": "medium", "explanation": "Multiply: 5×18=90", "needs_review": false, "correct_answer": "90"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 4", "difficulty": "medium", "explanation": "Multiply: 12×4=48", "needs_review": false, "correct_answer": "48"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 4", "difficulty": "medium", "explanation": "Multiply: 11×4=44", "needs_review": false, "correct_answer": "44"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 19", "difficulty": "medium", "explanation": "Multiply: 7×19=133", "needs_review": false, "correct_answer": "133"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 2", "difficulty": "medium", "explanation": "Multiply: 4×2=8", "needs_review": false, "correct_answer": "8"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 14", "difficulty": "medium", "explanation": "Multiply: 5×14=70", "needs_review": false, "correct_answer": "70"}]