Maths words! SL

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Across
  1. 1. best lesson
  2. 5. a clock goes backwards
  3. 8. the outside of a shap
  4. 9. does sums for you
  5. 10. +
  6. 12. 4 sided shape
  7. 13. top of a fractor
Down
  1. 1. x
  2. 2. sums with letters
  3. 3. -
  4. 4. a clock goes forwards
  5. 6. lines that never meet
  6. 7. measures angles
  7. 9. helps you draw circles
  8. 11. has 3 sides