Sum-letters Saga

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Across
  1. 3. I change my identity depending on the situation
  2. 6. I turn numbers into pictures
  3. 9. I am part of hundred and exam loves me
  4. 10. I only keep what everyone agrees on
  5. 11. I get very closed, but I never quite arrive
  6. 12. I do nothing all day, but without me your value drops dramatically
  7. 14. I take away but never steal
  8. 15. we look different but we are actually the same
  9. 17. I am the most popular one here
  10. 19. I divide completely without complaints
  11. 20. I can be right, acute or obtuse but never wrong
Down
  1. 1. I only trust myself and the number one
  2. 2. I tell you the chances, but never the certainty
  3. 4. I demand balance- whatever you do on one side, do on other
  4. 5. no matter what you do to me, I remain myself
  5. 7. I follow a pattern-do not break the order
  6. 8. I am what's left after sharing equally
  7. 13. I belong here but I am not the whole story
  8. 16. I am not complicated just misunderstood, I lie between real and imaginary
  9. 18. I am average but I am not boring