Math clues

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Across
  1. 4. what you do to mixed numbers
  2. 6. it is compared to ratios
  3. 7. you do this when you divide fractions
  4. 9. 2nd fraction upside down
  5. 10. an Equation
  6. 12. times 3
  7. 15. you use these in math
  8. 17. half
  9. 19. put things together
Down
  1. 1. multiply
  2. 2. put things together
  3. 3. answer
  4. 5. a number
  5. 8. total of something
  6. 11. -
  7. 13. what you do to subtract fractions
  8. 14. take away
  9. 16. Grouping things
  10. 18. to scale down a fraction