Tic tac toe board

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Across
  1. 4. above the line
  2. 6. finding a sum
  3. 8. Remainder after subtraction
  4. 11. Finding a quotient
  5. 12. Lowest or highest point
  6. 13. Vertical line
  7. 14. Below the line
  8. 18. finding a product
  9. 19. result from multiplication
  10. 20. Represents the power
Down
  1. 1. Not a whole number
  2. 2. When a problem is thoroughly simplified
  3. 3. Result of division
  4. 5. Rate of change
  5. 7. finding a difference
  6. 9. Two sides are equal
  7. 10. Placed before variable
  8. 15. result from addition
  9. 16. Not a fraction
  10. 17. Horizontal line