Time words used in Mathematics

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Across
  1. 3. right away; at once
  2. 5. occurring constantly or continually
  3. 7. in the end, after a long delay
  4. 12. happening once in a while
  5. 13. a very short period of time
Down
  1. 1. to be late or slow
  2. 2. at the same time
  3. 4. happening or done many times in a row
  4. 6. happening slowly or in stages
  5. 8. happening or coming before something else
  6. 9. happening quickly
  7. 10. a length of time during which something happens
  8. 11. done or happening often or many times