How to increase number fact speed, accuracy, and comprehension with addition & subtraction generalizations
By: [by Gilbert S. Macvaugh, Jr., and G. S. Macvaugh]
Contributors: Macvaugh, G. S.
Publisher: Arithmetic Clinic
Published: 1957
Place of publication: Chevy Chase, Md
Language: eng
Number of pages: 151
Subjects: Addition.; Subtraction.
Notes: Cover title.