Danny Dunn and the Homework Machine

From Author Wars - https://authorwars.com/publications/danny-dunn-and-the-homework-machine-261956.html

Overview:

Title: Danny Dunn and the Homework Machine
Author: Raymond Abrashkin, Jay Williams
Year: Unknown
Publisher: Scholastic Book Services
Pages: 122
Binding: Trade Paperback
Type: Novel
Title Reference: Danny Dunn and the Homework Machine
Notes:
No printed price on the copies used for this data, although the image from Amazon looks like it has 60c printed above the catalogue number.
Re publication date:
No specific date is given; however, both copies used for this data list DD & the Weather Machine and DD on the Ocean Floor on the copyright page (as well as DD & the Anti-Gravity Paint and DD on a Desert Island), so the date of this edition must be no earlier than 1960.
The number lines and other info are:
- Copy 1
  6 5 4 3 2 1 8 9/7 0 1 2/8
  Printed in Australia by Hedges & Bell Pty. Ltd.
- Copy 2:
  23 22 21 20 19 18 17 16 7 8 9/7 0 1 2/8
  Printed in the U.S.A. 11