[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 86 + 17", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "103"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Associative 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: 6 × 14", "difficulty": "medium", "explanation": "Multiply: 6×14=84", "needs_review": false, "correct_answer": "84"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 9 × 4", "difficulty": "medium", "explanation": "Multiply: 9×4=36", "needs_review": false, "correct_answer": "36"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 11", "difficulty": "medium", "explanation": "Multiply: 10×11=110", "needs_review": false, "correct_answer": "110"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 19", "difficulty": "medium", "explanation": "Multiply: 3×19=57", "needs_review": false, "correct_answer": "57"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 12", "difficulty": "medium", "explanation": "Multiply: 11×12=132", "needs_review": false, "correct_answer": "132"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 6", "difficulty": "medium", "explanation": "Multiply: 2×6=12", "needs_review": false, "correct_answer": "12"}]