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11

Across 11. If you multiplied by 1 to get the same # back

Down 1. If you multiplied the same nonzero # to both sides you have used the 2. If two items are equal to a third item, the two are equal 3. If you added the same non-zero # to both sides 4. If you changed a grouping rearranged parenthesis, but kept everything else in the same order 5. If you multiplied by a reciprocal to get 1 6. If you added opposite #’s and ended with 0 7. If you reversed the order of addition or multiplication 8. If something flipped sides of the equal sign 9. If you added 0 to get the same # back 10. If something is equal to its identical twin