SYMBOLS IN BASIC MATH

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Across
  1. 7. mod
  2. 8. approximation
  3. 9. subtraction
  4. 10. a^b
  5. 13. ≠
  6. 15. ±
Down
  1. 1. division / fraction
  2. 2. ≥
  3. 3. 1ppb = 1/1000000000
  4. 4. calculate expression inside first
  5. 5. [ ]
  6. 6. √a
  7. 11. 4√a
  8. 12. ab
  9. 14. ×