7 авг 2006 г. - counting on my fingers
Описание:
i started learning addition & subtraction but instead of doing it in my head, i needed to count the numbers on my fingers to help me. this is CONCRETE OPERATIONAL stage.Добавлено на ленту времени:
Дата:
7 авг 2006 г.
Сейчас
~ 17 г назад
