Find the words

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Across
  1. 3. is to cause a slight break or crack in it
  2. 6. is to keep it going
  3. 7. cent part of a 100 hundred
  4. 8. when they can work with and understand numbers
  5. 10. to mark the edge or border of something
  6. 11. is to change or organise something in a different way
  7. 12. Related to teeth
Down
  1. 1. is a device used to talk to someone in a different place
  2. 2. Several different types of them
  3. 4. is a piece of equipment used to measure the intensity of a light source
  4. 5. is to believe something will happen
  5. 9. to purposefully not do it