Fundamental Symbols of Mathematics

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Across
  1. 4. To ∝
  2. 5. ∠
  3. 7. Root √
  4. 10. ×
  5. 14. Equal ≠
  6. 15. ∑
  7. 16. !
  8. 17. Than <
  9. 19. ∏
  10. 20. Value |x|
Down
  1. 1. ÷
  2. 2. Than or Equal To ≥
  3. 3. %
  4. 6. Than >
  5. 8. ±
  6. 9. ∞
  7. 11. Than or Equal To ≤
  8. 12. +
  9. 13. -
  10. 18. =