Fay's NinesTask 54 ... Years 4  10SummaryEasy to state and easy to start. Arrange the nine digits 1 to 9 in the spaces to make three 3digit numbers whose sum is 999.This cameo includes an Investigation Guide. 
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IcebergA task is the tip of a learning iceberg. There is always more to a task than is recorded on the card. 
The task only asks for the first solution and then five more, but this opens the door to the mathematician's questions:
As a mathematician you need to look beyond what the task card says. I want you to collect data about this task until you can see links between the solutions you find.Nichola Brandon, St. Benedict's Primary School, Narrabundah, has supplied this Investigation Guide to help take the investigation further. It could also be used in a whole class investigation approach to this task. Observations which allow the task to be taken further include:

Whole Class InvestigationTasks are an invitation for two students to work like a mathematician. Tasks can also be modified to become whole class investigations which model how a mathematician works. 
This task can easily be converted to a whole class investigation by asking students to tear a piece of scrap paper into nine pieces and write the numbers 1 to 9. The challenge is to arrange them as three 3digit numbers so that the total is 999. For more ideas and discussion about this investigation, open a new browser tab (or page) and visit Maths300 Lesson 31, Fay's Nines, which includes additional challenges with nines in the answer line. 
Is it in Maths With Attitude?Maths With Attitude is a set of handson learning kits available from Years 310 which structure the use of tasks and whole class investigations into a week by week planner. 
The Fay's Nines task is an integral part of:
The Fay's Nines lesson is an integral part of:
