Elementary mathematics:
Nichols, Eugene D.
Elementary mathematics: Patterns and structure / Eugene D. Nichols / Frances Flournoy / Robert Kalin - Holt Rinehart & Winston - 394 páginas; 24 cm.
NUMBERS AND NUMBER NAMES - ADDITION AND SUBTRATION - OUR SYSTEM OF NUMERATION
STUDY AND TEACHING (PRIMARY)
MATHEMATICS
513.07 / N616
Elementary mathematics: Patterns and structure / Eugene D. Nichols / Frances Flournoy / Robert Kalin - Holt Rinehart & Winston - 394 páginas; 24 cm.
NUMBERS AND NUMBER NAMES - ADDITION AND SUBTRATION - OUR SYSTEM OF NUMERATION
STUDY AND TEACHING (PRIMARY)
MATHEMATICS
513.07 / N616