Maths words TB

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Across
  1. 3. what this crossword is about
  2. 5. amount of a liquid
  3. 7. something timesed by itself
  4. 9. something to draw circles
  5. 11. another word for subtraction
  6. 12. equations with letters
  7. 13. lines of a graph
Down
  1. 1. corners on a shape
  2. 2. 2 lines like train tracks
  3. 4. something to cheat while in a test
  4. 6. something to tell the time
  5. 7. something thats the same on all the sides
  6. 8. another for times
  7. 10. there are 4 right angle's
  8. 13. another word for addition