[{"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: 10 × 11", "difficulty": "medium", "explanation": "Multiply: 10×11=110", "needs_review": false, "correct_answer": "110"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 9", "difficulty": "medium", "explanation": "Multiply: 12×9=108", "needs_review": false, "correct_answer": "108"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 5", "difficulty": "medium", "explanation": "Multiply: 7×5=35", "needs_review": false, "correct_answer": "35"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 9", "difficulty": "medium", "explanation": "Multiply: 4×9=36", "needs_review": false, "correct_answer": "36"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 9", "difficulty": "medium", "explanation": "Multiply: 3×9=27", "needs_review": false, "correct_answer": "27"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 6", "difficulty": "medium", "explanation": "Multiply: 6×6=36", "needs_review": false, "correct_answer": "36"}]