The basic math puzzle

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Across
  1. 5. 4 is not equal to 3
  2. 6. or -2
  3. 10. point-2.45
  4. 11. 7=4+3
  5. 12. 4÷2=2
  6. 13. 4+3=7
  7. 14. 2³=8
Down
  1. 1. 3•3=9
  2. 2. 3>2
  3. 3. 4≥3
  4. 4. 7mod 2=1
  5. 7. √5
  6. 8. sin (0.01)~0.01,
  7. 9. 4<3