SYMBOLS IN BASIC MATH

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Across
  1. 4. 4√a
  2. 5. ≠
  3. 6. subtraction
  4. 8. a^b
  5. 9. ±
  6. 10. mod
  7. 11. √a
  8. 14. approximation
Down
  1. 1. ×
  2. 2. ≥
  3. 3. division / fraction
  4. 7. ab
  5. 12. 1ppb = 1/1000000000
  6. 13. calculate expression inside first