Puzzle

Casting Out Nines

See what happens when you cast out all the nines.

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Linked Resources

Instructions
There are three rows of mathematical expressions. The top expression says 31 equals 10 times 3 plus 1. The middle expression says equals 9 times 3 plus 3 times 1 plus 1. The 9 and the left-most 3 are purple and crossed out with a red diagonal line. The bottom expression says equals 3 plus 1. There is a blue border around the outside.