You don’t have to be a genius or complete any assignments. All of these books are fairly accessible to the average reader.
I read the majority of them in high school, and they set me (a dyslexic student with undiagnosed adhd) up for a lifetime love of mathematics.
Many of these books could also be categorized as popular science or history books. A couple of them, such as Surreal Numbers and Flatland, are actually fiction!
2003 • 3 Readers • 255 pages • 2
2002 • 5 Readers • 280 pages • 4
1959 • 4 Readers • 200 pages
2021 • 11 Readers • 225 pages • 4
2012 • 93 Readers • 421 pages • 4
2012 • 59 Readers • 336 pages • 4.1
2003 • 32 Readers • 335 pages • 4.3