Basic Math symbols

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Across
  1. 1. calculate expression inside first
  2. 2. equality [18] divison/fraction
  3. 4. multiplication
  4. 5. inequality [9] both plus and minus operations
  5. 6. both minus and plus operations
  6. 7. 1ppb 1/1000000000
  7. 8. 1ppm 1/1000000
  8. 9. subtraction
  9. 10. approximation
Down
  1. 1. exponent
  2. 2. exponent
  3. 3. remainder calculation
  4. 5. calculate expression inside first
  5. 6. decimal point
  6. 7. 1% = 1/100 [10] division
  7. 8. addition
  8. 9. less than or equal to