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Kangaroo Subtraction

Age 11 to 14 Short Challenge Level:

 

In this subtraction, each of the letters K, A, N, G, R and O represents a different digit.

                                             

What is the largest possible value of the number 'KAN'?



 

This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.