[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 86 + 92", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "178"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Associative property", "Identity property", "Commutative property", "Distributive 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: 4 × 3", "difficulty": "medium", "explanation": "Multiply: 4×3=12", "needs_review": false, "correct_answer": "12"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 4", "difficulty": "medium", "explanation": "Multiply: 2×4=8", "needs_review": false, "correct_answer": "8"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 4", "difficulty": "medium", "explanation": "Multiply: 16×4=64", "needs_review": false, "correct_answer": "64"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 15", "difficulty": "medium", "explanation": "Multiply: 20×15=300", "needs_review": false, "correct_answer": "300"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 7", "difficulty": "medium", "explanation": "Multiply: 5×7=35", "needs_review": false, "correct_answer": "35"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 3", "difficulty": "medium", "explanation": "Multiply: 10×3=30", "needs_review": false, "correct_answer": "30"}]