[{"id": 1, "type": "multiple_choice", "skill": "fractions", "options": ["3/8", "1/2", "3/4", "2/4"], "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: 14 × 5", "difficulty": "medium", "explanation": "Multiply: 14×5=70", "needs_review": false, "correct_answer": "70"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 13", "difficulty": "medium", "explanation": "Multiply: 2×13=26", "needs_review": false, "correct_answer": "26"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 7", "difficulty": "medium", "explanation": "Multiply: 15×7=105", "needs_review": false, "correct_answer": "105"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 17", "difficulty": "medium", "explanation": "Multiply: 16×17=272", "needs_review": false, "correct_answer": "272"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 4 × 13", "difficulty": "medium", "explanation": "Multiply: 4×13=52", "needs_review": false, "correct_answer": "52"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 4", "difficulty": "medium", "explanation": "Multiply: 16×4=64", "needs_review": false, "correct_answer": "64"}, {"id": 9, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 12", "difficulty": "medium", "explanation": "Multiply: 15×12=180", "needs_review": false, "correct_answer": "180"}, {"id": 10, "type": "short_answer", "skill": "computation", "question": "Calculate: 14 × 8", "difficulty": "medium", "explanation": "Multiply: 14×8=112", "needs_review": false, "correct_answer": "112"}, {"id": 11, "type": "short_answer", "skill": "computation", "question": "Calculate: 20 × 15", "difficulty": "medium", "explanation": "Multiply: 20×15=300", "needs_review": false, "correct_answer": "300"}, {"id": 12, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 15", "difficulty": "medium", "explanation": "Multiply: 8×15=120", "needs_review": false, "correct_answer": "120"}]