Extending those children who are reaching greater depth can be a real challenge. So we've got a real challenge for them! This Year 3 Order Numbers to 1,000 challenge focuses on, you guessed it, ordering numbers to 1,000. The resource comes in the form of a discussion problem - a collaborative task that encourages the use of mathematical language and the concept of working systematically. An answer sheet is provided so that children can self-mark or peer mark.