HarperCollins

Let's-Read-and-Find-Out Science Level 1

The middle half of these books measure 460L–590L, and run around 750 words — calculated from the 22 titles at this level with a Lexile measure, not from the number on the cover.

Books
26
Lexile range
460L–590L
Typical length
~750 words

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The next number up is usually a bigger jump than it looks. Browsing by measure instead keeps the difficulty steady while the books stay new.