n 50 Maths 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.
Photomath is a math education tool which allows the user to scan an algebra equation and provides step by step explanations to reach the answer. Photomath is available for iOS and Android, with both free and paid premium versions.
50 Maths Ideas You Really Need to Know