[{"id": 1, "type": "multiple_choice", "skill": "fractions", "options": ["3/8", "2/4", "1/2", "3/4"], "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: 17 × 2", "difficulty": "medium", "explanation": "Multiply: 17×2=34", "needs_review": false, "correct_answer": "34"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 17", "difficulty": "medium", "explanation": "Multiply: 10×17=170", "needs_review": false, "correct_answer": "170"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 3", "difficulty": "medium", "explanation": "Multiply: 2×3=6", "needs_review": false, "correct_answer": "6"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 4", "difficulty": "medium", "explanation": "Multiply: 16×4=64", "needs_review": false, "correct_answer": "64"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 13", "difficulty": "medium", "explanation": "Multiply: 12×13=156", "needs_review": false, "correct_answer": "156"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 7", "difficulty": "medium", "explanation": "Multiply: 17×7=119", "needs_review": false, "correct_answer": "119"}]