"Who invented zero? Why 60 seconds in a minute? How big is infinity? Where do parallel lines meet? And can a butterfly's wings really cause a storm on the far side of the world? In 50 Mathematical Ideas You Really Need to Know, Professor Tony Crilly explains in 50 clear and concise essays the mathematical concepts - ancient and modern, theoretical and practical, everyday and esoteric - that allow us to understand and shape the world around us.
This book reveals the huge role that mathematics plays in our lives. It lies hidden within the electronics we use, the banking we do, and even the leisure activities we enjoy. Whether we’re putting a down payment on a new car, reading the financial pages, or listening to our favourite songs, math is behind it all.
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Purplemath lessons have been written so that they may be studied in whatever manner the student finds most useful. The Purplemath lessons try not to assume any fixed ordering of topics, so that any student, regardless of the textbook being, may benefit.
Schaum's Outline of Mathematical Handbook of Formulas and Tables, Fifth Edition by 
50 mathematical ideas you really need to know by 
Our days are numbered : how mathematics orders our lives by 
