Crack the Code : Maths Mysteries for All Ages is packed with clever conundrums and ciphers for anyone interested in critical thinking, logical reasoning and mathematics, of course. Whether you are 11 or 41, you're going to love solving the 25 mysteries in this book that combine simple cryptology and arithmetic with some quick, out-of-the-box thinking. Use these innovative puzzle-based activities and stories to build problem-solving skills, remember maths concepts and practise mental maths in a way that's effective and, most importantly, interesting.