Hi, This Video is the 1st part of the Mental Maths Series where you will learn how to do lightning fast Calculations in a Snap Even faster ... ... <看更多>

Abacus & Mental Arithmetic & Mathematics Research Association of the R.O.C, Taipei Taiwan. 680 likes. Education. ... <看更多>

mental -arithmetic ... Web app for practicing mental math ... Add a description, image, and links to the mental-arithmetic topic page so that developers can ... ... <看更多>