[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 37 + 41", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "78"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Distributive property", "Identity 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: 15 × 14", "difficulty": "medium", "explanation": "Multiply: 15×14=210", "needs_review": false, "correct_answer": "210"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 3", "difficulty": "medium", "explanation": "Multiply: 12×3=36", "needs_review": false, "correct_answer": "36"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 10", "difficulty": "medium", "explanation": "Multiply: 9×10=90", "needs_review": false, "correct_answer": "90"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 5", "difficulty": "medium", "explanation": "Multiply: 6×5=30", "needs_review": false, "correct_answer": "30"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 19", "difficulty": "medium", "explanation": "Multiply: 14×19=266", "needs_review": false, "correct_answer": "266"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 15", "difficulty": "medium", "explanation": "Multiply: 12×15=180", "needs_review": false, "correct_answer": "180"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 16", "difficulty": "medium", "explanation": "Multiply: 7×16=112", "needs_review": false, "correct_answer": "112"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 19", "difficulty": "medium", "explanation": "Multiply: 16×19=304", "needs_review": false, "correct_answer": "304"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 5", "difficulty": "medium", "explanation": "Multiply: 13×5=65", "needs_review": false, "correct_answer": "65"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 18", "difficulty": "medium", "explanation": "Multiply: 19×18=342", "needs_review": false, "correct_answer": "342"}]