Explorers (ABDO); Checkerboard Library Books in Order
3 books by Kristin Petrie. Reading level: Grades 4.6–4.9. Lower Grades (Ages 5–8).
Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. Explorers (ABDO); Checkerboard Library (3 books by Kristin Petrie) lands at reading level Grades 4.6–4.9, with average content intensity 1.3/5. Intensity stays consistent across the series — a kid who can handle the first book can generally handle the rest.
The reading-order table below lists every book with per-volume reading level and intensity badges so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.
Content Intensity Across the Series
ConsistentContent stays at a steady intensity level throughout the series.
Explorers (ABDO); Checkerboard Library Reading Order
| # | Title | Reading Level | Content |
|---|---|---|---|
| 1 | Christopher Columbus Kristin Petrie | Level 4-5 | Gentle |
| 2 | Ferdinand Magellan Kristin Petrie | Level 4-5 | Gentle |
| 3 | John Smith Kristin Petrie | Level 4-5 | Mild |
All Explorers (ABDO); Checkerboard Library Books
Questions about the Explorers (ABDO); Checkerboard Library series
- What reading level is the Explorers (ABDO); Checkerboard Library series?
- The Explorers (ABDO); Checkerboard Library series by Kristin Petrie is at a Grades 4.6–4.9 reading level (average Grade 4.8). Intended for Lower Grades (Ages 5–8). There are 3 books in the series.
- What order should I read the Explorers (ABDO); Checkerboard Library books?
- The reading-order table above lists all 3 books with per-volume reading level and intensity ratings. Start with book 1 and read in publication order unless the table indicates a different recommended order for newer readers.
- What age is the Explorers (ABDO); Checkerboard Library series appropriate for?
- The Explorers (ABDO); Checkerboard Library series is recommended for Lower Grades (Ages 5–8). The average content intensity is 1.3/5. Check the intensity trajectory above to see whether content gets heavier across the series — if it does, sensitive readers may want to stop earlier in the run.