[{"id": 1, "type": "multiple_choice", "skill": "fractions", "options": ["3/4", "1/2", "2/4", "3/8"], "question": "What is 1/4 + 2/4?", "difficulty": "medium", "explanation": "Same denominator: add numerators. (1+2)/4=3/4.", "needs_review": false, "correct_answer": "3/4"}, {"id": 2, "type": "short_answer", "skill": "fractions", "question": "Simplify: 6/8", "difficulty": "medium", "explanation": "Divide numerator and denominator by GCF (2): 6÷2/8÷2=3/4.", "needs_review": false, "correct_answer": "3/4"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 17", "difficulty": "medium", "explanation": "Multiply: 5×17=85", "needs_review": false, "correct_answer": "85"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 12", "difficulty": "medium", "explanation": "Multiply: 17×12=204", "needs_review": false, "correct_answer": "204"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 8", "difficulty": "medium", "explanation": "Multiply: 17×8=136", "needs_review": false, "correct_answer": "136"}]