Math is hard

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Across
  1. 7. the action of mathing with adding
  2. 9. letters in the action of mathing
  3. 10. good, bad, weird
  4. 11. the action of dividing
  5. 13. the act of occurring the most
Down
  1. 1. the action of doing more then one thing
  2. 2. the action of adding
  3. 3. the action is minusing
  4. 4. a delicious treat
  5. 5. the action of mathing
  6. 6. the best minus the worst math
  7. 8. the action 3.14
  8. 12. the act of learning