[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 68 + 26", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "94"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Commutative property", "Distributive property", "Identity property", "Associative 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 × 17", "difficulty": "medium", "explanation": "Multiply: 4×17=68", "needs_review": false, "correct_answer": "68"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 16", "difficulty": "medium", "explanation": "Multiply: 12×16=192", "needs_review": false, "correct_answer": "192"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 14", "difficulty": "medium", "explanation": "Multiply: 17×14=238", "needs_review": false, "correct_answer": "238"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 14", "difficulty": "medium", "explanation": "Multiply: 8×14=112", "needs_review": false, "correct_answer": "112"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 19", "difficulty": "medium", "explanation": "Multiply: 20×19=380", "needs_review": false, "correct_answer": "380"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 8", "difficulty": "medium", "explanation": "Multiply: 10×8=80", "needs_review": false, "correct_answer": "80"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 5", "difficulty": "medium", "explanation": "Multiply: 3×5=15", "needs_review": false, "correct_answer": "15"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 8", "difficulty": "medium", "explanation": "Multiply: 18×8=144", "needs_review": false, "correct_answer": "144"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 18 × 7", "difficulty": "medium", "explanation": "Multiply: 18×7=126", "needs_review": false, "correct_answer": "126"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 7", "difficulty": "medium", "explanation": "Multiply: 15×7=105", "needs_review": false, "correct_answer": "105"}]