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Measures range from 200L for beginning readers to 1600L+ for advanced and collegiate literature. Matching a student's score with a book's measure places them in the optimal comprehension zone (75% comprehension range).
| Grade Level | Lexile Range |
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| Kindergarten | BR (Beginning Reader) - 275L |
| Grade 1 | 190L to 530L |
| Grade 2 | 420L to 650L |
| Grade 3 | 520L to 820L |
| Grade 4 | 740L to 940L |
| Grade 5 | 830L to 1010L |
| Grades 6 - 8 | 925L to 1185L |
| Grades 9 - 10 | 1050L to 1335L |
| Grades 11 - 12 | 1185L to 1385L+ |
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