[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 74 + 14", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "88"}, {"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: 12 × 15", "difficulty": "medium", "explanation": "Multiply: 12×15=180", "needs_review": false, "correct_answer": "180"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 3", "difficulty": "medium", "explanation": "Multiply: 7×3=21", "needs_review": false, "correct_answer": "21"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 5", "difficulty": "medium", "explanation": "Multiply: 20×5=100", "needs_review": false, "correct_answer": "100"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 4", "difficulty": "medium", "explanation": "Multiply: 12×4=48", "needs_review": false, "correct_answer": "48"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 5", "difficulty": "medium", "explanation": "Multiply: 17×5=85", "needs_review": false, "correct_answer": "85"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 4", "difficulty": "medium", "explanation": "Multiply: 15×4=60", "needs_review": false, "correct_answer": "60"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 8", "difficulty": "medium", "explanation": "Multiply: 11×8=88", "needs_review": false, "correct_answer": "88"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 13", "difficulty": "medium", "explanation": "Multiply: 17×13=221", "needs_review": false, "correct_answer": "221"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 19", "difficulty": "medium", "explanation": "Multiply: 17×19=323", "needs_review": false, "correct_answer": "323"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 13", "difficulty": "medium", "explanation": "Multiply: 8×13=104", "needs_review": false, "correct_answer": "104"}]