Hi guys, Welcome to the Advanced Video Search Engine, and you are watching How to Calculate Faster than a Calculator - Mental Maths #2| Addition and Subtraction. That video is uploaded by mathOgenius at 2020-11-16T03:57:04-08:00. We are promoting this video only for entertainment and educational purpose only. So, I hope you like & enjoy it. [Hs0wjbxvCt0]