TY  - BOOK
AU  - Osborn, Roger.
CN  - QA135.5
CN  - QA135.5
CY  - Columbus, Ohio,
DA  - [c1968]
ID  - 229663
KW  - Mathematics
KW  - Arithmetic
N1  - Revision of Toward improved understanding of mathematics, part I, by M. V. DeVault, published in 1960, and of part of the combined revised ed. by R. Osborn and others, published in 1961 under the title Extending mathematics understanding.
PB  - C. E. Merrill
PP  - Columbus, Ohio,
PY  - [c1968]
T1  - Understanding the number system
TI  - Understanding the number system
ER  -