Books like Primary Mathematics Textbook
Singapore Math
Primary Mathematics Textbook is 12 pages, about 13 minutes at 250 words a minute.
7 books to read next
How long each takes
What Is Mathematics? 9.6 h 
Concrete Mathematics 12.1 h 
In Pursuit of the Unknown 6.6 h 
Matemáticas Básicas 3.7 h 
Mathematics 2.6 h 
Everyday Math for Dummies 5.9 h 
Consider a Spherical Cow 5.2 h Bar height shows length. Estimated at 250 words a minute.