The big machines

Name: The big machines
Author: Charles A. Jortberg
ISBN: 1562397257

Age Rating, Reading Level & Content Guide

by Charles A. Jortberg

Kids and Computers

Reading Level 7-8 C · Gentle Ages 9-12 Sweet Spot Page-Turner

The text is written at a 7th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes. Its HootRating code, C, means gentle content.

Find on Amazon Listen on Audible

We may earn a commission from these links.

About This Book

Discover how computers have transformed the world in just a few decades, shaping everything from business and communication to air traffic control and space exploration. This fascinating journey reveals the powerful machines behind modern technology and their incredible impact on daily life.

Themes

Science & NatureTechnologyEducation

Quick Assessment

This is a Level 7-8 book with gentle content intensity. It's a Sweet Spot read — challenging text with gentle themes, ideal for advanced or 2e readers. No notable content concerns flagged. Written for readers ages 9-12.

Why we rated The big machines C (Gentle)

The big machines is written at a Level 7-8 reading level across 39 pages (approximately 3,230 words). Middle Grades (Ages 9-12) is the typical interest range for this book — readers in that age band have the maturity and attention span suited to the story, separate from whether they can decode the words.

Read aloud, The big machines takes about 22 minutes, which fits within a single read-aloud session.

We rate The big machines as C (Gentle) because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.

No specific content flags were raised by community reviewers, which is consistent with the gentle intensity score.

Thematically, The big machines explores science & nature, technology, and education — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about science & nature, technology, education.
✓ Readers who fall hard for one book and want a long series to live in — there are 5 more books in the Kids and Computers series.
✓ Curious kids who prefer real-world topics over made-up stories.

Maybe not for

! Readers looking for something heavier — this is a gentle, low-stakes story by design.

For Parents

Content Intensity

C · Gentle

Emotional

Gentle

Physical

Gentle

Social

Gentle

Thematic

Gentle

Reading the HootRating code: the first letter is the content intensity (C = Gentle · L = Mild · M = Moderate · I = Intense · V = Very Intense); the second, when there is one, is the kind of content that drives it (E = Emotional · P = Physical · S = Social · T = Thematic). Reading level and age range are rated separately. How we rate

No conflict beyond everyday childhood experiences. Safe for sensitive readers.

Data confidence: standard

Was our "Gentle" content intensity rating accurate for this book?