[{"id": 1, "type": "short_answer", "skill": "computation", "question": "Calculate: 38 + 68", "difficulty": "medium", "explanation": "Add systematically.", "needs_review": false, "correct_answer": "106"}, {"id": 2, "type": "multiple_choice", "skill": "properties", "options": ["Distributive property", "Identity property", "Associative 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: 14 × 14", "difficulty": "medium", "explanation": "Multiply: 14×14=196", "needs_review": false, "correct_answer": "196"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 19", "difficulty": "medium", "explanation": "Multiply: 15×19=285", "needs_review": false, "correct_answer": "285"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 4", "difficulty": "medium", "explanation": "Multiply: 3×4=12", "needs_review": false, "correct_answer": "12"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 15", "difficulty": "medium", "explanation": "Multiply: 8×15=120", "needs_review": false, "correct_answer": "120"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 8", "difficulty": "medium", "explanation": "Multiply: 16×8=128", "needs_review": false, "correct_answer": "128"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 6", "difficulty": "medium", "explanation": "Multiply: 19×6=114", "needs_review": false, "correct_answer": "114"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 15", "difficulty": "medium", "explanation": "Multiply: 3×15=45", "needs_review": false, "correct_answer": "45"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 10", "difficulty": "medium", "explanation": "Multiply: 10×10=100", "needs_review": false, "correct_answer": "100"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 18", "difficulty": "medium", "explanation": "Multiply: 12×18=216", "needs_review": false, "correct_answer": "216"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 13", "difficulty": "medium", "explanation": "Multiply: 11×13=143", "needs_review": false, "correct_answer": "143"}]