✦ LIBER ✦
Pipe cleaners and loops-discovering how to add and subtract directed numbers
✍ Scribed by HERBERT FREMONT
- Book ID
- 125072274
- Publisher
- National Council of Teachers of Mathematics
- Year
- 1966
- Weight
- 534 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0004-136X
- DOI
- 10.2307/41187165
No coin nor oath required. For personal study only.