Puzzle

Casting Out Nines

See what happens when you cast out all the nines.

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.