The work in this book was created by the 2013 Mathematics Enrichment class of St Stephen's School (Carramar). The students solved a variety of problems from the nrich website (nrich.maths.org) and from the Mathematics Challenge for Young Australians (www.amt.edu.au/mcya.html). The aims were to profile the different methods used by each student, and to challenge the class in working collaboratively by creating work that can be appreciated by friends and family.