TY  - BOOK
AU  - Litwiller,Bonnie H
AU  - Duncan,David R.
TI  - Activities for the maintenance of computational skills and the discovery of patterns /Bonnie H. Litwiller and David R. Duncan
AV  - QA139 .A285 1980
PY  - 1980///
CY  - Reston, Virginia
PB  - National Council of Teachers of Mathematics
KW  - Arithmetic
KW  - Problems, exercises, etc
N1  - 2
ER  -