[{"id": 1, "type": "short_answer", "skill": "subtraction", "question": "Calculate: 1161 − 472", "difficulty": "medium", "explanation": "Subtract by place value, borrowing as needed.", "needs_review": false, "correct_answer": "689"}, {"id": 2, "type": "multiple_choice", "skill": "subtraction", "options": ["689", "1633", "687", "690"], "question": "What is 1161 − 472?", "difficulty": "easy", "explanation": "1161-472=689", "needs_review": false, "correct_answer": "689"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 19", "difficulty": "medium", "explanation": "Multiply: 10×19=190", "needs_review": false, "correct_answer": "190"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 19", "difficulty": "medium", "explanation": "Multiply: 14×19=266", "needs_review": false, "correct_answer": "266"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 3", "difficulty": "medium", "explanation": "Multiply: 4×3=12", "needs_review": false, "correct_answer": "12"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 19 × 15", "difficulty": "medium", "explanation": "Multiply: 19×15=285", "needs_review": false, "correct_answer": "285"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 3", "difficulty": "medium", "explanation": "Multiply: 12×3=36", "needs_review": false, "correct_answer": "36"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 5", "difficulty": "medium", "explanation": "Multiply: 12×5=60", "needs_review": false, "correct_answer": "60"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 11", "difficulty": "medium", "explanation": "Multiply: 7×11=77", "needs_review": false, "correct_answer": "77"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 11", "difficulty": "medium", "explanation": "Multiply: 20×11=220", "needs_review": false, "correct_answer": "220"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 13 × 2", "difficulty": "medium", "explanation": "Multiply: 13×2=26", "needs_review": false, "correct_answer": "26"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 5", "difficulty": "medium", "explanation": "Multiply: 16×5=80", "needs_review": false, "correct_answer": "80"}]