9813 /www/nrich/html/content/id/9813/ 10 2013-01-17T14:09:50 <?xml version="1.0" encoding="UTF-8"?> <mdoxml version="1.0">Mathematicians try to work systematically so they can see how they worked something out, and see patterns which messy work might not reveal. Scroll down to see our complete collection of upper primary problems that require you to work systematically, or explore the two sub-collections.</mdoxml> 2 3 0 1 0 0 0 Header for 9812.