Secrets of mental math the mathemagician's guide to lightning calculation and amazing math tricks gan Benjamin, Arthur

Table of contents only

Mental math gan Mariano, Ma. Luisa

Mental math gan Mariano, Ma. Luisa

Arithmetricks 50 easy ways to add, subtract, multiply, and divide without a calculator gan Julius, Edward H. 1952-

Estimation and mental computation 1986 yearbook

Estimation and mental computation 1986 yearbook

Estimation and mental computation 1986 yearbook

The magic of numbers gan Tocquet, Robert