17

Searching for lost fragments in GEO

Year:
2008
Language:
english
File:
PDF, 370 KB
english, 2008
32

Introduction to the numeration of two-place numbers

Year:
1969
Language:
english
File:
PDF, 357 KB
english, 1969
33

Learning multiplication facts—more than a drill

Year:
1971
Language:
english
File:
PDF, 396 KB
english, 1971
34

A new algorithm for subtraction?

Year:
1974
Language:
english
File:
PDF, 520 KB
english, 1974