9574 /www/nrich/html/content/id/9574/ 10 2012-10-19T16:28:10 <?xml version="1.0" encoding="UTF-8"?> <mdoxml version="1.0">The key to solving these problems is to notice patterns or properties. Encouraging students to organise their work in a systematic way will allow them to notice what might not otherwise be obvious.</mdoxml> 2 3 0 0 0 0 0 Header for 9542