Rapid Math Tricks And Tips

This is a 30-day self-teaching guide designed to help the reader master common maths problems without a calculator. It uses tips and techniques to teach the bas... » 

This is a 30-day self-teaching guide designed to help the reader master common maths problems without a calculator. It uses tips and techniques to teach the basics of multiplication, division, subtraction and addition as well as estimation and more advanced techniques. «