Fold 1
- Ages
- 4–6
- Reading grade
- Pre-K–K
- Stage
- First Reader
- Book
- 6 × 9 in, 24 pp
- Words
- 101
- Words a sentence
- 3.4
- Longest sentence
- 7 words
- Flesch–Kincaid grade
- -2.5
For educators
Six books on the same six stones, from a child's first book to read alone to popular science for adults. A class can study the same facts with every reader in a book they can manage.
Rare Stone
| Measure | Fold 1 | Fold 2 | Fold 3 | Fold 4 | Fold 5 | Fold 6 |
|---|---|---|---|---|---|---|
| Ages | 4–6 | 6–8 | 8–10 | 10–12 | 12+ | 12+ |
| Reading grade | Pre-K–K | not graded | not graded | not graded | not graded | not graded |
| Stage | First Reader | Read Together | Early Reader | Explorer | Field Guide | Deep Dive |
| Book | 6 × 9 in, 24 pp | 8.5 × 8.5 in, 32 pp | 6 × 9 in, 32 pp | 8 × 10 in, 40 pp | 8 × 10 in, 48 pp | 6 × 9 in, 64 pp |
| Words | 101 | coming | coming | coming | coming | coming |
| Words a sentence | 3.4 | coming | coming | coming | coming | coming |
| Longest sentence | 7 words | coming | coming | coming | coming | coming |
| Flesch–Kincaid grade | -2.5 | coming | coming | coming | coming | coming |
Fold 2
- Ages
- 6–8
- Reading grade
- not graded
- Stage
- Read Together
- Book
- 8.5 × 8.5 in, 32 pp
- Words
- coming
- Words a sentence
- coming
- Longest sentence
- coming
- Flesch–Kincaid grade
- coming
Fold 3
- Ages
- 8–10
- Reading grade
- not graded
- Stage
- Early Reader
- Book
- 6 × 9 in, 32 pp
- Words
- coming
- Words a sentence
- coming
- Longest sentence
- coming
- Flesch–Kincaid grade
- coming
Fold 4
- Ages
- 10–12
- Reading grade
- not graded
- Stage
- Explorer
- Book
- 8 × 10 in, 40 pp
- Words
- coming
- Words a sentence
- coming
- Longest sentence
- coming
- Flesch–Kincaid grade
- coming
Fold 5
- Ages
- 12+
- Reading grade
- not graded
- Stage
- Field Guide
- Book
- 8 × 10 in, 48 pp
- Words
- coming
- Words a sentence
- coming
- Longest sentence
- coming
- Flesch–Kincaid grade
- coming
Fold 6
- Ages
- 12+
- Reading grade
- not graded
- Stage
- Deep Dive
- Book
- 6 × 9 in, 64 pp
- Words
- coming
- Words a sentence
- coming
- Longest sentence
- coming
- Flesch–Kincaid grade
- coming