Abacus Tutorial: 5 Complementary numbers - calculating up to 10
35.8 هزار بار بازدید -
12 سال پیش
-
Description: This film shows how
Description: This film shows how you calculate up to 10 using the "complementary numbers method" and the modern abacus (4+1). Practise your skills with the Mental Abacus app for Android or vist www.abakusen.se for more information.
12 سال پیش
در تاریخ 1392/01/20 منتشر شده
است.
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