03-22-2018, 05:15 AM
![[Image: 512QD3337CL._SX310_BO1,204,203,200_.jpg]](https://images-na.ssl-images-amazon.com/images/I/512QD3337CL._SX310_BO1,204,203,200_.jpg)
Demonstrates how to solve math problems more quickly in one's head than with a calculator, and describes mathematical tricks and shortcuts.
Download:
Code:
https://mega.nz/#!xq5H3YCD!J5gQJyB3L6oulecIM_5MtN75hamEuaJd-Zjn-ZlHiFE