Hello guys, Welcome to Africa's Largest Video Search Engine, and you are watching How to Calculate Faster than a Calculator - Mental Maths #2| Addition and Subtraction. and this video is uploaded by mathOgenius at 2020-11-16T03:57:04-08:00. We are just promoting this video only for entertainment and educational purpose only. I hop you like our Video Search Engine. [Hs0wjbxvCt0]