Well, well... are you all on holidays? This is a great problem for
those of you who like playing around with numbers. But you won't
get anywhere without making some lists of numbers or tables. Here's
a tip: have a look in the Teacher's Notes. There are some examles
of tables in there. It's best to build your own tables, but these
will show you how you might find some patterns. For example, are
there any numbers that keep appearing? 
<p>We'd be very pleased to hear about anything you discover.</p>